21122011 has 8 divisors (see below), whose sum is σ = 21728448. Its totient is φ = 20520000.

The previous prime is 21122009. The next prime is 21122033. The reversal of 21122011 is 11022112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21122011 - 2¹ = 21122009 is a prime.

It is a super-2 number, since 2×21122011² = 892278697368242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21122111) 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 7 ways as a sum of consecutive naturals, for example, 10161 + ... + 12061.

It is an arithmetic number, because the mean of its divisors is an integer number (2716056).

Almost surely, 2^21122011 is an apocalyptic number.

21122011 is a deficient number, since it is larger than the sum of its proper divisors (606437).

21122011 is a wasteful number, since it uses less digits than its factorization.

21122011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2213.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 21122011 is about 4595.8689058762. The cubic root of 21122011 is about 276.4257021929.

Adding to 21122011 its reverse (11022112), we get a palindrome (32144123).

It can be divided in two parts, 211 and 22011, that added together give a palindrome (22222).

The spelling of 21122011 in words is "twenty-one million, one hundred twenty-two thousand, eleven".