21377416140 has 72 divisors (see below), whose sum is σ = 64864472400. Its totient is φ = 5698917504.

The previous prime is 21377416129. The next prime is 21377416169. The reversal of 21377416140 is 4161477312.

21377416140 is a `hidden beast` number, since 2 + 1 + 37 + 7 + 4 + 1 + 614 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 21377416095 and 21377416104.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 645711 + ... + 678009.

It is an arithmetic number, because the mean of its divisors is an integer number (900895450).

Almost surely, 2^21377416140 is an apocalyptic number.

21377416140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21377416140 is an abundant number, since it is smaller than the sum of its proper divisors (43487056260).

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

21377416140 is a wasteful number, since it uses less digits than its factorization.

21377416140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35991 (or 35986 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The spelling of 21377416140 in words is "twenty-one billion, three hundred seventy-seven million, four hundred sixteen thousand, one hundred forty".