21764975232 has 384 divisors, whose sum is σ = 79019236800. Its totient is φ = 5217730560.

The previous prime is 21764975189. The next prime is 21764975251. The reversal of 21764975232 is 23257946712.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2686644 + ... + 2694732.

Almost surely, 2^21764975232 is an apocalyptic number.

21764975232 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21764975232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39509618400).

21764975232 is an abundant number, since it is smaller than the sum of its proper divisors (57254261568).

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

21764975232 is a wasteful number, since it uses less digits than its factorization.

21764975232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8144 (or 8125 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 48.

The spelling of 21764975232 in words is "twenty-one billion, seven hundred sixty-four million, nine hundred seventy-five thousand, two hundred thirty-two".