21031030313121 has 16 divisors (see below), whose sum is σ = 28778928998400. Its totient is φ = 13656667673040.

The previous prime is 21031030313113. The next prime is 21031030313143. The reversal of 21031030313121 is 12131303013012.

It is a happy number.

It is not a de Polignac number, because 21031030313121 - 2³ = 21031030313113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21031030313101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 594784921 + ... + 594820278.

It is an arithmetic number, because the mean of its divisors is an integer number (1798683062400).

Almost surely, 2^{21031030313121} is an apocalyptic number.

It is an amenable number.

21031030313121 is a deficient number, since it is larger than the sum of its proper divisors (7747898685279).

21031030313121 is a wasteful number, since it uses less digits than its factorization.

21031030313121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189605356.

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 21031030313121 its reverse (12131303013012), we get a palindrome (33162333326133).

The spelling of 21031030313121 in words is "twenty-one trillion, thirty-one billion, thirty million, three hundred thirteen thousand, one hundred twenty-one".