21377874985 has 32 divisors (see below), whose sum is σ = 28410076800. Its totient is φ = 15379683840.

The previous prime is 21377874983. The next prime is 21377875031. The reversal of 21377874985 is 58947877312.

It is not a de Polignac number, because 21377874985 - 2¹ = 21377874983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21377874983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 69946 + ... + 218284.

It is an arithmetic number, because the mean of its divisors is an integer number (887814900).

Almost surely, 2^21377874985 is an apocalyptic number.

It is an amenable number.

21377874985 is a deficient number, since it is larger than the sum of its proper divisors (7032201815).

21377874985 is a wasteful number, since it uses less digits than its factorization.

21377874985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148441.

The product of its digits is 23708160, while the sum is 61.

The spelling of 21377874985 in words is "twenty-one billion, three hundred seventy-seven million, eight hundred seventy-four thousand, nine hundred eighty-five".