21088061191055 has 4 divisors (see below), whose sum is σ = 25305673429272. Its totient is φ = 16870448952840.

The previous prime is 21088061191033. The next prime is 21088061191069. The reversal of 21088061191055 is 55019116088012.

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

It is not a de Polignac number, because 21088061191055 - 2³⁸ = 20813183284111 is a prime.

It is a Duffinian number.

It is a congruent 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, 2108806119101 + ... + 2108806119110.

It is an arithmetic number, because the mean of its divisors is an integer number (6326418357318).

Almost surely, 2^{21088061191055} is an apocalyptic number.

21088061191055 is a deficient number, since it is larger than the sum of its proper divisors (4217612238217).

21088061191055 is an equidigital number, since it uses as much as digits as its factorization.

21088061191055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4217612238216.

The product of its (nonzero) digits is 172800, while the sum is 47.

The spelling of 21088061191055 in words is "twenty-one trillion, eighty-eight billion, sixty-one million, one hundred ninety-one thousand, fifty-five".