21668732477880 has 64 divisors (see below), whose sum is σ = 65007259236000. Its totient is φ = 5778234278400.

The previous prime is 21668732477869. The next prime is 21668732477933. The reversal of 21668732477880 is 8877423786612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6062430 + ... + 8949330.

Almost surely, 2^{21668732477880} is an apocalyptic number.

21668732477880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21668732477880 is an abundant number, since it is smaller than the sum of its proper divisors (43338526758120).

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

21668732477880 is a wasteful number, since it uses less digits than its factorization.

21668732477880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2949464 (or 2949460 counting only the distinct ones).

The product of its (nonzero) digits is 303464448, while the sum is 69.

The spelling of 21668732477880 in words is "twenty-one trillion, six hundred sixty-eight billion, seven hundred thirty-two million, four hundred seventy-seven thousand, eight hundred eighty".