21477477140737 has 4 divisors (see below), whose sum is σ = 22607870674480. Its totient is φ = 20347083606996.

The previous prime is 21477477140701. The next prime is 21477477140747. The reversal of 21477477140737 is 73704177477412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21477477140737 - 2²⁷ = 21477342923009 is a prime.

It is a super-2 number, since 2×21477477140737² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21477477140747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 565196766843 + ... + 565196766880.

It is an arithmetic number, because the mean of its divisors is an integer number (5651967668620).

Almost surely, 2^{21477477140737} is an apocalyptic number.

It is an amenable number.

21477477140737 is a deficient number, since it is larger than the sum of its proper divisors (1130393533743).

21477477140737 is a wasteful number, since it uses less digits than its factorization.

21477477140737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1130393533742.

The product of its (nonzero) digits is 45177216, while the sum is 61.

The spelling of 21477477140737 in words is "twenty-one trillion, four hundred seventy-seven billion, four hundred seventy-seven million, one hundred forty thousand, seven hundred thirty-seven".