21212312320013 has 32 divisors (see below), whose sum is σ = 22550391091200. Its totient is φ = 19897420478400.

The previous prime is 21212312319977. The next prime is 21212312320057. The reversal of 21212312320013 is 31002321321212.

It is a cyclic number.

It is not a de Polignac number, because 21212312320013 - 2²⁶ = 21212245211149 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 (21212312320313) 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, 3170271998 + ... + 3170278688.

It is an arithmetic number, because the mean of its divisors is an integer number (704699721600).

Almost surely, 2^{21212312320013} is an apocalyptic number.

It is an amenable number.

21212312320013 is a deficient number, since it is larger than the sum of its proper divisors (1338078771187).

21212312320013 is a wasteful number, since it uses less digits than its factorization.

21212312320013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10713.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21212312320013 its reverse (31002321321212), we get a palindrome (52214633641225).

The spelling of 21212312320013 in words is "twenty-one trillion, two hundred twelve billion, three hundred twelve million, three hundred twenty thousand, thirteen".