21889774636902 has 12 divisors (see below), whose sum is σ = 47427845046660. Its totient is φ = 7296591545628.

The previous prime is 21889774636871. The next prime is 21889774636931. The reversal of 21889774636902 is 20963647798812.

21889774636902 is a `hidden beast` number, since 2 + 1 + 8 + 8 + 9 + 77 + 463 + 6 + 90 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 608049295452 + ... + 608049295487.

It is an arithmetic number, because the mean of its divisors is an integer number (3952320420555).

Almost surely, 2^{21889774636902} is an apocalyptic number.

21889774636902 is an abundant number, since it is smaller than the sum of its proper divisors (25538070409758).

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

21889774636902 is a wasteful number, since it uses less digits than its factorization.

21889774636902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1216098590947 (or 1216098590944 counting only the distinct ones).

The product of its (nonzero) digits is 438939648, while the sum is 72.

The spelling of 21889774636902 in words is "twenty-one trillion, eight hundred eighty-nine billion, seven hundred seventy-four million, six hundred thirty-six thousand, nine hundred two".