215754157520021 has 8 divisors (see below), whose sum is σ = 216308414484480. Its totient is φ = 215200554548688.

The previous prime is 215754157519997. The next prime is 215754157520089. The reversal of 215754157520021 is 120025751457512.

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

It is a cyclic number.

It is not a de Polignac number, because 215754157520021 - 2¹⁴ = 215754157503637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215754117520021) 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, 162837626 + ... + 164157243.

It is an arithmetic number, because the mean of its divisors is an integer number (27038551810560).

Almost surely, 2^{215754157520021} is an apocalyptic number.

It is an amenable number.

215754157520021 is a deficient number, since it is larger than the sum of its proper divisors (554256964459).

215754157520021 is a wasteful number, since it uses less digits than its factorization.

215754157520021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326996563.

The product of its (nonzero) digits is 980000, while the sum is 47.

The spelling of 215754157520021 in words is "two hundred fifteen trillion, seven hundred fifty-four billion, one hundred fifty-seven million, five hundred twenty thousand, twenty-one".