21210304332 has 96 divisors (see below), whose sum is σ = 57193776640. Its totient is φ = 5992496640.

The previous prime is 21210304321. The next prime is 21210304343. The reversal of 21210304332 is 23340301212.

It is an interprime number because it is at equal distance from previous prime (21210304321) and next prime (21210304343).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 21210304299 and 21210304308.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5226048 + ... + 5230104.

Almost surely, 2^21210304332 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 21210304332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28596888320).

21210304332 is an abundant number, since it is smaller than the sum of its proper divisors (35983472308).

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

21210304332 is a wasteful number, since it uses less digits than its factorization.

21210304332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4751 (or 4749 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21210304332 its reverse (23340301212), we get a palindrome (44550605544).

The spelling of 21210304332 in words is "twenty-one billion, two hundred ten million, three hundred four thousand, three hundred thirty-two".