21030102131 has 4 divisors (see below), whose sum is σ = 21386544600. Its totient is φ = 20673659664.

The previous prime is 21030102097. The next prime is 21030102211. The reversal of 21030102131 is 13120103012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21030102131 is a prime.

It is a super-2 number, since 2×21030102131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21030102631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178221146 + ... + 178221263.

It is an arithmetic number, because the mean of its divisors is an integer number (5346636150).

Almost surely, 2^21030102131 is an apocalyptic number.

21030102131 is a deficient number, since it is larger than the sum of its proper divisors (356442469).

21030102131 is an equidigital number, since it uses as much as digits as its factorization.

21030102131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356442468.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21030102131 its reverse (13120103012), we get a palindrome (34150205143).

The spelling of 21030102131 in words is "twenty-one billion, thirty million, one hundred two thousand, one hundred thirty-one".