21117407260 has 24 divisors (see below), whose sum is σ = 44452411920. Its totient is φ = 8426799744.

The previous prime is 21117407257. The next prime is 21117407279. The reversal of 21117407260 is 6270471112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1251609 + ... + 1268368.

It is an arithmetic number, because the mean of its divisors is an integer number (1852183830).

Almost surely, 2^21117407260 is an apocalyptic number.

21117407260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21117407260 is an abundant number, since it is smaller than the sum of its proper divisors (23335004660).

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

21117407260 is a wasteful number, since it uses less digits than its factorization.

21117407260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2520405 (or 2520403 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 31.

Adding to 21117407260 its reverse (6270471112), we get a palindrome (27387878372).

The spelling of 21117407260 in words is "twenty-one billion, one hundred seventeen million, four hundred seven thousand, two hundred sixty".