21313200232121 has 12 divisors (see below), whose sum is σ = 25875046848768. Its totient is φ = 17193842202432.

The previous prime is 21313200232099. The next prime is 21313200232133. The reversal of 21313200232121 is 12123200231312.

It is not a de Polignac number, because 21313200232121 - 2⁶ = 21313200232057 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 (21313200232321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5267719241 + ... + 5267723286.

It is an arithmetic number, because the mean of its divisors is an integer number (2156253904064).

Almost surely, 2^{21313200232121} is an apocalyptic number.

It is an amenable number.

21313200232121 is a deficient number, since it is larger than the sum of its proper divisors (4561846616647).

21313200232121 is a wasteful number, since it uses less digits than its factorization.

21313200232121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10535442568 (or 10535442551 counting only the distinct ones).

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

Adding to 21313200232121 its reverse (12123200231312), we get a palindrome (33436400463433).

The spelling of 21313200232121 in words is "twenty-one trillion, three hundred thirteen billion, two hundred million, two hundred thirty-two thousand, one hundred twenty-one".