21365506577157 has 8 divisors (see below), whose sum is σ = 28511341553376. Its totient is φ = 14231671326192.

The previous prime is 21365506577123. The next prime is 21365506577209. The reversal of 21365506577157 is 75177560556312.

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

It is not a de Polignac number, because 21365506577157 - 2¹⁴ = 21365506560773 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21365506577157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21365506577057) 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, 2999927158 + ... + 2999934279.

It is an arithmetic number, because the mean of its divisors is an integer number (3563917694172).

Almost surely, 2^{21365506577157} is an apocalyptic number.

It is an amenable number.

21365506577157 is a deficient number, since it is larger than the sum of its proper divisors (7145834976219).

21365506577157 is a wasteful number, since it uses less digits than its factorization.

21365506577157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5999862627.

The product of its (nonzero) digits is 46305000, while the sum is 60.

The spelling of 21365506577157 in words is "twenty-one trillion, three hundred sixty-five billion, five hundred six million, five hundred seventy-seven thousand, one hundred fifty-seven".