21477372337455 has 16 divisors (see below), whose sum is σ = 34367100518400. Its totient is φ = 11453496987168.

The previous prime is 21477372337441. The next prime is 21477372337481. The reversal of 21477372337455 is 55473327377412.

It is not a de Polignac number, because 21477372337455 - 2⁴ = 21477372337439 is a prime.

It is a super-2 number, since 2×21477372337455² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

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, 68688367 + ... + 69000336.

It is an arithmetic number, because the mean of its divisors is an integer number (2147943782400).

Almost surely, 2^{21477372337455} is an apocalyptic number.

21477372337455 is a deficient number, since it is larger than the sum of its proper divisors (12889728180945).

21477372337455 is a wasteful number, since it uses less digits than its factorization.

21477372337455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137699110.

The product of its digits is 103723200, while the sum is 60.

The spelling of 21477372337455 in words is "twenty-one trillion, four hundred seventy-seven billion, three hundred seventy-two million, three hundred thirty-seven thousand, four hundred fifty-five".