21311022354757 has 4 divisors (see below), whose sum is σ = 21567781660320. Its totient is φ = 21054263049196.

The previous prime is 21311022354737. The next prime is 21311022354793. The reversal of 21311022354757 is 75745322011312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21311022354757 - 2¹¹ = 21311022352709 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 (21311022354707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128379652657 + ... + 128379652822.

It is an arithmetic number, because the mean of its divisors is an integer number (5391945415080).

Almost surely, 2^{21311022354757} is an apocalyptic number.

It is an amenable number.

21311022354757 is a deficient number, since it is larger than the sum of its proper divisors (256759305563).

21311022354757 is an equidigital number, since it uses as much as digits as its factorization.

21311022354757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256759305562.

The product of its (nonzero) digits is 352800, while the sum is 43.

The spelling of 21311022354757 in words is "twenty-one trillion, three hundred eleven billion, twenty-two million, three hundred fifty-four thousand, seven hundred fifty-seven".