21377079361 has 16 divisors (see below), whose sum is σ = 23730177600. Its totient is φ = 19092672000.

The previous prime is 21377079323. The next prime is 21377079407. The reversal of 21377079361 is 16397077312.

It is a cyclic number.

It is not a de Polignac number, because 21377079361 - 2¹⁹ = 21376555073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21377079961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1159705 + ... + 1177993.

It is an arithmetic number, because the mean of its divisors is an integer number (1483136100).

Almost surely, 2^21377079361 is an apocalyptic number.

It is an amenable number.

21377079361 is a deficient number, since it is larger than the sum of its proper divisors (2353098239).

21377079361 is a wasteful number, since it uses less digits than its factorization.

21377079361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20160.

The product of its (nonzero) digits is 333396, while the sum is 46.

The spelling of 21377079361 in words is "twenty-one billion, three hundred seventy-seven million, seventy-nine thousand, three hundred sixty-one".