21020296752 has 480 divisors, whose sum is σ = 77814464000. Its totient is φ = 5248986624.

The previous prime is 21020296747. The next prime is 21020296777. The reversal of 21020296752 is 25769202012.

It is a happy number.

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

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, 12198963 + ... + 12200685.

Almost surely, 2^21020296752 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 21020296752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38907232000).

21020296752 is an abundant number, since it is smaller than the sum of its proper divisors (56794167248).

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

21020296752 is a wasteful number, since it uses less digits than its factorization.

21020296752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1790 (or 1767 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

Adding to 21020296752 its reverse (25769202012), we get a palindrome (46789498764).

The spelling of 21020296752 in words is "twenty-one billion, twenty million, two hundred ninety-six thousand, seven hundred fifty-two".