21966055815 has 96 divisors (see below), whose sum is σ = 40249198080. Its totient is φ = 10144288000.

The previous prime is 21966055807. The next prime is 21966055843. The reversal of 21966055815 is 51855066912.

It is not a de Polignac number, because 21966055815 - 2³ = 21966055807 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 31334965 + ... + 31335665.

It is an arithmetic number, because the mean of its divisors is an integer number (419262480).

Almost surely, 2^21966055815 is an apocalyptic number.

21966055815 is a deficient number, since it is larger than the sum of its proper divisors (18283142265).

21966055815 is a wasteful number, since it uses less digits than its factorization.

21966055815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125 (or 1102 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 48.

The spelling of 21966055815 in words is "twenty-one billion, nine hundred sixty-six million, fifty-five thousand, eight hundred fifteen".