21196771775 has 12 divisors (see below), whose sum is σ = 26579325600. Its totient is φ = 16766882880.

The previous prime is 21196771741. The next prime is 21196771781. The reversal of 21196771775 is 57717769112.

It is not a de Polignac number, because 21196771775 - 2⁶ = 21196771711 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4761095 + ... + 4765544.

It is an arithmetic number, because the mean of its divisors is an integer number (2214943800).

Almost surely, 2^21196771775 is an apocalyptic number.

21196771775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21196771775 is a deficient number, since it is larger than the sum of its proper divisors (5382553825).

21196771775 is an equidigital number, since it uses as much as digits as its factorization.

21196771775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9526738 (or 9526733 counting only the distinct ones).

The product of its digits is 1296540, while the sum is 53.

The spelling of 21196771775 in words is "twenty-one billion, one hundred ninety-six million, seven hundred seventy-one thousand, seven hundred seventy-five".