21117576033 has 12 divisors (see below), whose sum is σ = 31554999060. Its totient is φ = 13592922336.

The previous prime is 21117575959. The next prime is 21117576037. The reversal of 21117576033 is 33067571112.

It can be written as a sum of positive squares in 2 ways, for example, as 9179172864 + 11938403169 = 95808^2 + 109263^2 .

It is not a de Polignac number, because 21117576033 - 2⁸ = 21117575777 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21117576037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40454866 + ... + 40455387.

It is an arithmetic number, because the mean of its divisors is an integer number (2629583255).

Almost surely, 2^21117576033 is an apocalyptic number.

It is an amenable number.

21117576033 is a deficient number, since it is larger than the sum of its proper divisors (10437423027).

21117576033 is a wasteful number, since it uses less digits than its factorization.

21117576033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80910288 (or 80910285 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 36.

The spelling of 21117576033 in words is "twenty-one billion, one hundred seventeen million, five hundred seventy-six thousand, thirty-three".