21476516665377 has 16 divisors (see below), whose sum is σ = 29313417481920. Its totient is φ = 13978922345472.

The previous prime is 21476516665367. The next prime is 21476516665399. The reversal of 21476516665377 is 77356661567412.

It is not a de Polignac number, because 21476516665377 - 2⁴ = 21476516665361 is a prime.

It is a super-2 number, since 2×21476516665377² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21476516665367) 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, 34128552 + ... + 34752137.

It is an arithmetic number, because the mean of its divisors is an integer number (1832088592620).

Almost surely, 2^{21476516665377} is an apocalyptic number.

It is an amenable number.

21476516665377 is a deficient number, since it is larger than the sum of its proper divisors (7836900816543).

21476516665377 is a wasteful number, since it uses less digits than its factorization.

21476516665377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68883152.

The product of its digits is 266716800, while the sum is 66.

The spelling of 21476516665377 in words is "twenty-one trillion, four hundred seventy-six billion, five hundred sixteen million, six hundred sixty-five thousand, three hundred seventy-seven".