21311313122121 has 32 divisors (see below), whose sum is σ = 33511647206400. Its totient is φ = 11905453586880.

The previous prime is 21311313122087. The next prime is 21311313122137. The reversal of 21311313122121 is 12122131311312.

It is not a de Polignac number, because 21311313122121 - 2¹³ = 21311313113929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21311313122091 and 21311313122100.

It is not an unprimeable number, because it can be changed into a prime (21311313122521) 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, 459292141 + ... + 459338538.

It is an arithmetic number, because the mean of its divisors is an integer number (1047238975200).

Almost surely, 2^{21311313122121} is an apocalyptic number.

It is an amenable number.

21311313122121 is a deficient number, since it is larger than the sum of its proper divisors (12200334084279).

21311313122121 is a wasteful number, since it uses less digits than its factorization.

21311313122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918630749.

The product of its digits is 432, while the sum is 24.

Adding to 21311313122121 its reverse (12122131311312), we get a palindrome (33433444433433).

The spelling of 21311313122121 in words is "twenty-one trillion, three hundred eleven billion, three hundred thirteen million, one hundred twenty-two thousand, one hundred twenty-one".