21221023102131 has 16 divisors (see below), whose sum is σ = 28453354135200. Its totient is φ = 14068238638848.

The previous prime is 21221023102091. The next prime is 21221023102133. The reversal of 21221023102131 is 13120132012212.

It is not a de Polignac number, because 21221023102131 - 2⁶ = 21221023102067 is a prime.

It is a super-2 number, since 2×21221023102131² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21221023102098 and 21221023102107.

It is not an unprimeable number, because it can be changed into a prime (21221023102133) 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, 26890296 + ... + 27668213.

It is an arithmetic number, because the mean of its divisors is an integer number (1778334633450).

Almost surely, 2^{21221023102131} is an apocalyptic number.

21221023102131 is a deficient number, since it is larger than the sum of its proper divisors (7232331033069).

21221023102131 is a wasteful number, since it uses less digits than its factorization.

21221023102131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54559238.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21221023102131 its reverse (13120132012212), we get a palindrome (34341155114343).

The spelling of 21221023102131 in words is "twenty-one trillion, two hundred twenty-one billion, twenty-three million, one hundred two thousand, one hundred thirty-one".