21553167666436 has 24 divisors (see below), whose sum is σ = 43166288551680. Its totient is φ = 9224224738752.

The previous prime is 21553167666413. The next prime is 21553167666469. The reversal of 21553167666436 is 63466676135512.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 535276105 + ... + 535316368.

It is an arithmetic number, because the mean of its divisors is an integer number (1798595356320).

Almost surely, 2^{21553167666436} is an apocalyptic number.

It is an amenable number.

21553167666436 is an abundant number, since it is smaller than the sum of its proper divisors (21613120885244).

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

21553167666436 is a wasteful number, since it uses less digits than its factorization.

21553167666436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1070593203 (or 1070593201 counting only the distinct ones).

The product of its digits is 97977600, while the sum is 61.

The spelling of 21553167666436 in words is "twenty-one trillion, five hundred fifty-three billion, one hundred sixty-seven million, six hundred sixty-six thousand, four hundred thirty-six".