21853156836 has 24 divisors (see below), whose sum is σ = 58275085120. Its totient is φ = 6243759072.

The previous prime is 21853156823. The next prime is 21853156847. The reversal of 21853156836 is 63865135812.

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, 130078231 + ... + 130078398.

Almost surely, 2^21853156836 is an apocalyptic number.

It is an amenable number.

21853156836 is an abundant number, since it is smaller than the sum of its proper divisors (36421928284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21853156836 is a wasteful number, since it uses less digits than its factorization.

21853156836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260156643 (or 260156641 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 48.

The spelling of 21853156836 in words is "twenty-one billion, eight hundred fifty-three million, one hundred fifty-six thousand, eight hundred thirty-six".