21117381080 has 16 divisors (see below), whose sum is σ = 47514107520. Its totient is φ = 8446952416.

The previous prime is 21117381053. The next prime is 21117381091. The reversal of 21117381080 is 8018371112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263967224 + ... + 263967303.

It is an arithmetic number, because the mean of its divisors is an integer number (2969631720).

Almost surely, 2^21117381080 is an apocalyptic number.

21117381080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21117381080 is an abundant number, since it is smaller than the sum of its proper divisors (26396726440).

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

21117381080 is a wasteful number, since it uses less digits than its factorization.

21117381080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527934538 (or 527934534 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 32.

The spelling of 21117381080 in words is "twenty-one billion, one hundred seventeen million, three hundred eighty-one thousand, eighty".