21022102131 has 16 divisors (see below), whose sum is σ = 29683307808. Its totient is φ = 13188096000.

The previous prime is 21022102081. The next prime is 21022102133. The reversal of 21022102131 is 13120122012.

It is a de Polignac number, because none of the positive numbers 2^k-21022102131 is a prime.

It is a super-2 number, since 2×21022102131² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21022102131.

It is not an unprimeable number, because it can be changed into a prime (21022102133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 298731 + ... + 362331.

It is an arithmetic number, because the mean of its divisors is an integer number (1855206738).

Almost surely, 2^21022102131 is an apocalyptic number.

21022102131 is a deficient number, since it is larger than the sum of its proper divisors (8661205677).

21022102131 is a wasteful number, since it uses less digits than its factorization.

21022102131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70102.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21022102131 its reverse (13120122012), we get a palindrome (34142224143).

The spelling of 21022102131 in words is "twenty-one billion, twenty-two million, one hundred two thousand, one hundred thirty-one".