21102013131 has 8 divisors (see below), whose sum is σ = 29043631104. Its totient is φ = 13614201960.

The previous prime is 21102013103. The next prime is 21102013157. The reversal of 21102013131 is 13131020112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21102013131 - 2⁵ = 21102013099 is a prime.

It is a super-2 number, since 2×21102013131² (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 21102013131.

It is not an unprimeable number, because it can be changed into a prime (21102013631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113451591 + ... + 113451776.

It is an arithmetic number, because the mean of its divisors is an integer number (3630453888).

Almost surely, 2^21102013131 is an apocalyptic number.

21102013131 is a deficient number, since it is larger than the sum of its proper divisors (7941617973).

21102013131 is a wasteful number, since it uses less digits than its factorization.

21102013131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226903401.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21102013131 its reverse (13131020112), we get a palindrome (34233033243).

The spelling of 21102013131 in words is "twenty-one billion, one hundred two million, thirteen thousand, one hundred thirty-one".