21481452454257 has 48 divisors (see below), whose sum is σ = 32012915800320. Its totient is φ = 13870422792576.

The previous prime is 21481452454247. The next prime is 21481452454277. The reversal of 21481452454257 is 75245425418412.

21481452454257 is a `hidden beast` number, since 2 + 1 + 4 + 8 + 1 + 45 + 2 + 4 + 542 + 57 = 666.

It is not a de Polignac number, because 21481452454257 - 2²⁷ = 21481318236529 is a prime.

It is a super-2 number, since 2×21481452454257² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21481452454207) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 64992268 + ... + 65321954.

It is an arithmetic number, because the mean of its divisors is an integer number (666935745840).

Almost surely, 2^{21481452454257} is an apocalyptic number.

It is an amenable number.

21481452454257 is a deficient number, since it is larger than the sum of its proper divisors (10531463346063).

21481452454257 is a wasteful number, since it uses less digits than its factorization.

21481452454257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330622 (or 330619 counting only the distinct ones).

The product of its digits is 14336000, while the sum is 54.

The spelling of 21481452454257 in words is "twenty-one trillion, four hundred eighty-one billion, four hundred fifty-two million, four hundred fifty-four thousand, two hundred fifty-seven".