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21941331 = 37313777
BaseRepresentation
bin101001110110…
…0110001010011
31112021201211220
41103230301103
521104110311
62102140123
7354332616
oct123546123
945251756
1021941331
1111426935
127421643
134712c49
142cb217d
151dd6206
hex14ecc53

21941331 has 4 divisors (see below), whose sum is σ = 29255112. Its totient is φ = 14627552.

The previous prime is 21941329. The next prime is 21941351. The reversal of 21941331 is 13314912.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21941331 - 21 = 21941329 is a prime.

It is a super-2 number, since 2×219413312 = 962844012103122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21941351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3656886 + ... + 3656891.

It is an arithmetic number, because the mean of its divisors is an integer number (7313778).

Almost surely, 221941331 is an apocalyptic number.

21941331 is a deficient number, since it is larger than the sum of its proper divisors (7313781).

21941331 is an equidigital number, since it uses as much as digits as its factorization.

21941331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7313780.

The product of its digits is 648, while the sum is 24.

The square root of 21941331 is about 4684.1574482504. The cubic root of 21941331 is about 279.9546312547.

The spelling of 21941331 in words is "twenty-one million, nine hundred forty-one thousand, three hundred thirty-one".

Divisors: 1 3 7313777 21941331