21102131020 has 12 divisors (see below), whose sum is σ = 44314475184. Its totient is φ = 8440852400.

The previous prime is 21102130999. The next prime is 21102131041. The reversal of 21102131020 is 2013120112.

It is an interprime number because it is at equal distance from previous prime (21102130999) and next prime (21102131041).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 527553256 + ... + 527553295.

It is an arithmetic number, because the mean of its divisors is an integer number (3692872932).

Almost surely, 2^21102131020 is an apocalyptic number.

21102131020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21102131020 is an abundant number, since it is smaller than the sum of its proper divisors (23212344164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21102131020 is a wasteful number, since it uses less digits than its factorization.

21102131020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055106560 (or 1055106558 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21102131020 its reverse (2013120112), we get a palindrome (23115251132).

The spelling of 21102131020 in words is "twenty-one billion, one hundred two million, one hundred thirty-one thousand, twenty".