21364766574155 has 4 divisors (see below), whose sum is σ = 25637719888992. Its totient is φ = 17091813259320.

The previous prime is 21364766574131. The next prime is 21364766574169. The reversal of 21364766574155 is 55147566746312.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21364766574155 - 2⁶ = 21364766574091 is a prime.

It is a super-2 number, since 2×21364766574155² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2136476657411 + ... + 2136476657420.

It is an arithmetic number, because the mean of its divisors is an integer number (6409429972248).

Almost surely, 2^{21364766574155} is an apocalyptic number.

21364766574155 is a deficient number, since it is larger than the sum of its proper divisors (4272953314837).

21364766574155 is an equidigital number, since it uses as much as digits as its factorization.

21364766574155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4272953314836.

The product of its digits is 127008000, while the sum is 62.

The spelling of 21364766574155 in words is "twenty-one trillion, three hundred sixty-four billion, seven hundred sixty-six million, five hundred seventy-four thousand, one hundred fifty-five".