21377875065 has 16 divisors (see below), whose sum is σ = 34216184256. Its totient is φ = 11397672000.

The previous prime is 21377875039. The next prime is 21377875087. The reversal of 21377875065 is 56057877312.

It is not a de Polignac number, because 21377875065 - 2⁵ = 21377875033 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21377874999 and 21377875017.

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, 195286 + ... + 284415.

It is an arithmetic number, because the mean of its divisors is an integer number (2138511516).

Almost surely, 2^21377875065 is an apocalyptic number.

It is an amenable number.

21377875065 is a deficient number, since it is larger than the sum of its proper divisors (12838309191).

21377875065 is a wasteful number, since it uses less digits than its factorization.

21377875065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482680.

The product of its (nonzero) digits is 2469600, while the sum is 51.

The spelling of 21377875065 in words is "twenty-one billion, three hundred seventy-seven million, eight hundred seventy-five thousand, sixty-five".