21233172384 has 96 divisors (see below), whose sum is σ = 64622759040. Its totient is φ = 6769990656.

The previous prime is 21233172383. The next prime is 21233172409. The reversal of 21233172384 is 48327133212.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21233172383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 514377 + ... + 554120.

It is an arithmetic number, because the mean of its divisors is an integer number (673153740).

Almost surely, 2^21233172384 is an apocalyptic number.

21233172384 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21233172384 is an abundant number, since it is smaller than the sum of its proper divisors (43389586656).

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

21233172384 is a wasteful number, since it uses less digits than its factorization.

21233172384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068539 (or 1068525 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The spelling of 21233172384 in words is "twenty-one billion, two hundred thirty-three million, one hundred seventy-two thousand, three hundred eighty-four".