21086992275 has 12 divisors (see below), whose sum is σ = 34863827352. Its totient is φ = 11246395840.

The previous prime is 21086992249. The next prime is 21086992279. The reversal of 21086992275 is 57229968012.

It is not a de Polignac number, because 21086992275 - 2¹⁰ = 21086991251 is a prime.

It is a super-2 number, since 2×21086992275² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21086992279) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 140579874 + ... + 140580023.

It is an arithmetic number, because the mean of its divisors is an integer number (2905318946).

Almost surely, 2^21086992275 is an apocalyptic number.

21086992275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21086992275 is a deficient number, since it is larger than the sum of its proper divisors (13776835077).

21086992275 is a wasteful number, since it uses less digits than its factorization.

21086992275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281159910 (or 281159905 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 51.

The spelling of 21086992275 in words is "twenty-one billion, eighty-six million, nine hundred ninety-two thousand, two hundred seventy-five".