215120455400421 has 24 divisors (see below), whose sum is σ = 311817940370976. Its totient is φ = 142911717426720.

The previous prime is 215120455400353. The next prime is 215120455400503. The reversal of 215120455400421 is 124004554021512.

215120455400421 is a `hidden beast` number, since 2 + 1 + 5 + 1 + 204 + 5 + 5 + 400 + 42 + 1 = 666.

It is not a de Polignac number, because 215120455400421 - 2³⁹ = 214570699586533 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215120455400021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11128470 + ... + 23538983.

It is an arithmetic number, because the mean of its divisors is an integer number (12992414182124).

Almost surely, 2^{215120455400421} is an apocalyptic number.

It is an amenable number.

215120455400421 is a deficient number, since it is larger than the sum of its proper divisors (96697484970555).

215120455400421 is a wasteful number, since it uses less digits than its factorization.

215120455400421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34669873 (or 34669870 counting only the distinct ones).

The product of its (nonzero) digits is 64000, while the sum is 36.

The spelling of 215120455400421 in words is "two hundred fifteen trillion, one hundred twenty billion, four hundred fifty-five million, four hundred thousand, four hundred twenty-one".