21235372032 has 208 divisors, whose sum is σ = 66948647040. Its totient is φ = 5857345536.

The previous prime is 21235372019. The next prime is 21235372049. The reversal of 21235372032 is 23027353212.

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, 2490208 + ... + 2498720.

Almost surely, 2^21235372032 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 21235372032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33474323520).

21235372032 is an abundant number, since it is smaller than the sum of its proper divisors (45713275008).

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

21235372032 is an equidigital number, since it uses as much as digits as its factorization.

21235372032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8576 (or 8554 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 30.

The spelling of 21235372032 in words is "twenty-one billion, two hundred thirty-five million, three hundred seventy-two thousand, thirty-two".