21102131024 has 160 divisors (see below), whose sum is σ = 46567686144. Its totient is φ = 9196830720.

The previous prime is 21102130999. The next prime is 21102131041. The reversal of 21102131024 is 42013120112.

It is a junction number, because it is equal to n+sod(n) for n = 21102130993 and 21102131011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59779232 + ... + 59779584.

Almost surely, 2^21102131024 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21102131024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23283843072).

21102131024 is an abundant number, since it is smaller than the sum of its proper divisors (25465555120).

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

21102131024 is a wasteful number, since it uses less digits than its factorization.

21102131024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605 (or 599 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21102131024 its reverse (42013120112), we get a palindrome (63115251136).

The spelling of 21102131024 in words is "twenty-one billion, one hundred two million, one hundred thirty-one thousand, twenty-four".