21660156410 has 16 divisors (see below), whose sum is σ = 38991766176. Its totient is φ = 8663288208.

The previous prime is 21660156403. The next prime is 21660156431. The reversal of 21660156410 is 1465106612.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 28397 + ... + 210063.

It is an arithmetic number, because the mean of its divisors is an integer number (2436985386).

Almost surely, 2^21660156410 is an apocalyptic number.

21660156410 is a deficient number, since it is larger than the sum of its proper divisors (17331609766).

21660156410 is a wasteful number, since it uses less digits than its factorization.

21660156410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193597.

The product of its (nonzero) digits is 8640, while the sum is 32.

The spelling of 21660156410 in words is "twenty-one billion, six hundred sixty million, one hundred fifty-six thousand, four hundred ten".