21202415124 has 48 divisors (see below), whose sum is σ = 54175080960. Its totient is φ = 6400534240.

The previous prime is 21202415111. The next prime is 21202415137. The reversal of 21202415124 is 42151420212.

It is an interprime number because it is at equal distance from previous prime (21202415111) and next prime (21202415137).

It is a junction number, because it is equal to n+sod(n) for n = 21202415094 and 21202415103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 270654 + ... + 340085.

It is an arithmetic number, because the mean of its divisors is an integer number (1128647520).

Almost surely, 2^21202415124 is an apocalyptic number.

It is an amenable number.

21202415124 is an abundant number, since it is smaller than the sum of its proper divisors (32972665836).

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

21202415124 is a wasteful number, since it uses less digits than its factorization.

21202415124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611020 (or 611018 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

Adding to 21202415124 its reverse (42151420212), we get a palindrome (63353835336).

The spelling of 21202415124 in words is "twenty-one billion, two hundred two million, four hundred fifteen thousand, one hundred twenty-four".