21666844794232 has 128 divisors (see below), whose sum is σ = 49597894080000. Its totient is φ = 8756169776640.

The previous prime is 21666844794193. The next prime is 21666844794239. The reversal of 21666844794232 is 23249744866612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21666844794239) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3277107 + ... + 7353442.

It is an arithmetic number, because the mean of its divisors is an integer number (387483547500).

Almost surely, 2^{21666844794232} is an apocalyptic number.

21666844794232 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21666844794232 is an abundant number, since it is smaller than the sum of its proper divisors (27931049285768).

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

21666844794232 is a wasteful number, since it uses less digits than its factorization.

21666844794232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10630661 (or 10630657 counting only the distinct ones).

The product of its digits is 167215104, while the sum is 64.

The spelling of 21666844794232 in words is "twenty-one trillion, six hundred sixty-six billion, eight hundred forty-four million, seven hundred ninety-four thousand, two hundred thirty-two".