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22235221 = 22939697
BaseRepresentation
bin101010011010…
…0100001010101
31112211122222201
41110310201111
521143011341
62112324501
7356665501
oct124644125
945748881
1022235221
1111607718
127543731
1347b6948
142d4b301
151e43331
hex1534855

22235221 has 4 divisors (see below), whose sum is σ = 22247212. Its totient is φ = 22223232.

The previous prime is 22235219. The next prime is 22235231. The reversal of 22235221 is 12253222.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4468996 + 17766225 = 2114^2 + 4215^2 .

It is a cyclic number.

It is not a de Polignac number, because 22235221 - 21 = 22235219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22235231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2556 + ... + 7141.

It is an arithmetic number, because the mean of its divisors is an integer number (5561803).

Almost surely, 222235221 is an apocalyptic number.

22235221 is the 2521-st centered heptagonal number.

It is an amenable number.

22235221 is a deficient number, since it is larger than the sum of its proper divisors (11991).

22235221 is an equidigital number, since it uses as much as digits as its factorization.

22235221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11990.

The product of its digits is 480, while the sum is 19.

The square root of 22235221 is about 4715.4237349362. The cubic root of 22235221 is about 281.1990290512.

Adding to 22235221 its reverse (12253222), we get a palindrome (34488443).

The spelling of 22235221 in words is "twenty-two million, two hundred thirty-five thousand, two hundred twenty-one".

Divisors: 1 2293 9697 22235221