21477560451 has 8 divisors (see below), whose sum is σ = 28899470160. Its totient is φ = 14187012192.

The previous prime is 21477560441. The next prime is 21477560479. The reversal of 21477560451 is 15406577412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21477560451 - 2³³ = 12887625859 is a prime.

It is a super-2 number, since 2×21477560451² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21477560431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32839980 + ... + 32840633.

It is an arithmetic number, because the mean of its divisors is an integer number (3612433770).

Almost surely, 2^21477560451 is an apocalyptic number.

21477560451 is a deficient number, since it is larger than the sum of its proper divisors (7421909709).

21477560451 is a wasteful number, since it uses less digits than its factorization.

21477560451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65680725.

The product of its (nonzero) digits is 235200, while the sum is 42.

The spelling of 21477560451 in words is "twenty-one billion, four hundred seventy-seven million, five hundred sixty thousand, four hundred fifty-one".