21037501632 has 896 divisors, whose sum is σ = 77248512000. Its totient is φ = 5007163392.

The previous prime is 21037501619. The next prime is 21037501633. The reversal of 21037501632 is 23610573012.

It is a self number, because there is not a number n which added to its sum of digits gives 21037501632.

It is not an unprimeable number, because it can be changed into a prime (21037501633) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 489244203 + ... + 489244245.

Almost surely, 2^21037501632 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21037501632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38624256000).

21037501632 is an abundant number, since it is smaller than the sum of its proper divisors (56211010368).

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

21037501632 is a wasteful number, since it uses less digits than its factorization.

21037501632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138 (or 114 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 30.

The spelling of 21037501632 in words is "twenty-one billion, thirty-seven million, five hundred one thousand, six hundred thirty-two".