21566195002 has 32 divisors (see below), whose sum is σ = 37728872064. Its totient is φ = 9136588800.

The previous prime is 21566194981. The next prime is 21566195023. The reversal of 21566195002 is 20059166512.

It is an interprime number because it is at equal distance from previous prime (21566194981) and next prime (21566195023).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 241399 + ... + 318442.

It is an arithmetic number, because the mean of its divisors is an integer number (1179027252).

Almost surely, 2^21566195002 is an apocalyptic number.

21566195002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21566195002 is a deficient number, since it is larger than the sum of its proper divisors (16162677062).

21566195002 is a wasteful number, since it uses less digits than its factorization.

21566195002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559974.

The product of its (nonzero) digits is 32400, while the sum is 37.

The spelling of 21566195002 in words is "twenty-one billion, five hundred sixty-six million, one hundred ninety-five thousand, two".