21233312110021 has 32 divisors (see below), whose sum is σ = 25108352096256. Its totient is φ = 17736697440000.

The previous prime is 21233312110009. The next prime is 21233312110057. The reversal of 21233312110021 is 12001121333212.

It is not a de Polignac number, because 21233312110021 - 2²⁵ = 21233278555589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21233312109974 and 21233312110001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233312110091) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16515796 + ... + 17754946.

It is an arithmetic number, because the mean of its divisors is an integer number (784636003008).

Almost surely, 2^{21233312110021} is an apocalyptic number.

It is an amenable number.

21233312110021 is a deficient number, since it is larger than the sum of its proper divisors (3875039986235).

21233312110021 is a wasteful number, since it uses less digits than its factorization.

21233312110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241353.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21233312110021 its reverse (12001121333212), we get a palindrome (33234433443233).

The spelling of 21233312110021 in words is "twenty-one trillion, two hundred thirty-three billion, three hundred twelve million, one hundred ten thousand, twenty-one".