21632365440 has 768 divisors, whose sum is σ = 91530915840. Its totient is φ = 4777574400.

The previous prime is 21632365427. The next prime is 21632365451. The reversal of 21632365440 is 4456323612.

21632365440 is a `hidden beast` number, since 21 + 63 + 2 + 36 + 544 + 0 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 21632365395 and 21632365404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 33747520 + ... + 33748160.

It is an arithmetic number, because the mean of its divisors is an integer number (119180880).

Almost surely, 2^21632365440 is an apocalyptic number.

21632365440 is a gapful number since it is divisible by the number (20) 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 21632365440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45765457920).

21632365440 is an abundant number, since it is smaller than the sum of its proper divisors (69898550400).

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

21632365440 is an equidigital number, since it uses as much as digits as its factorization.

21632365440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713 (or 689 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The spelling of 21632365440 in words is "twenty-one billion, six hundred thirty-two million, three hundred sixty-five thousand, four hundred forty".