21312110013321 has 16 divisors (see below), whose sum is σ = 29184838097600. Its totient is φ = 13823745726528.

The previous prime is 21312110013287. The next prime is 21312110013377. The reversal of 21312110013321 is 12331001121312.

It is not a de Polignac number, because 21312110013321 - 2³⁵ = 21277750274953 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21312110011321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2517435 + ... + 6997263.

It is an arithmetic number, because the mean of its divisors is an integer number (1824052381100).

Almost surely, 2^{21312110013321} is an apocalyptic number.

It is an amenable number.

21312110013321 is a deficient number, since it is larger than the sum of its proper divisors (7872728084279).

21312110013321 is a wasteful number, since it uses less digits than its factorization.

21312110013321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4522728.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 21312110013321 its reverse (12331001121312), we get a palindrome (33643111134633).

The spelling of 21312110013321 in words is "twenty-one trillion, three hundred twelve billion, one hundred ten million, thirteen thousand, three hundred twenty-one".