21902755457593 has 4 divisors (see below), whose sum is σ = 22166644077648. Its totient is φ = 21638866837540.

The previous prime is 21902755457573. The next prime is 21902755457629. The reversal of 21902755457593 is 39575455720912.

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 21902755457593 - 2⁹ = 21902755457081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21902755457543) 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, 131944309903 + ... + 131944310068.

It is an arithmetic number, because the mean of its divisors is an integer number (5541661019412).

Almost surely, 2^{21902755457593} is an apocalyptic number.

It is an amenable number.

21902755457593 is a deficient number, since it is larger than the sum of its proper divisors (263888620055).

21902755457593 is an equidigital number, since it uses as much as digits as its factorization.

21902755457593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263888620054.

The product of its (nonzero) digits is 119070000, while the sum is 64.

The spelling of 21902755457593 in words is "twenty-one trillion, nine hundred two billion, seven hundred fifty-five million, four hundred fifty-seven thousand, five hundred ninety-three".