21153004432 has 120 divisors (see below), whose sum is σ = 48694279200. Its totient is φ = 8873722368.

The previous prime is 21153004427. The next prime is 21153004447. The reversal of 21153004432 is 23440035112.

It is a junction number, because it is equal to n+sod(n) for n = 21153004397 and 21153004406.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7953919 + ... + 7956577.

It is an arithmetic number, because the mean of its divisors is an integer number (405785660).

Almost surely, 2^21153004432 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 21153004432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24347139600).

21153004432 is an abundant number, since it is smaller than the sum of its proper divisors (27541274768).

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

21153004432 is a wasteful number, since it uses less digits than its factorization.

21153004432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2893 (or 2880 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21153004432 its reverse (23440035112), we get a palindrome (44593039544).

The spelling of 21153004432 in words is "twenty-one billion, one hundred fifty-three million, four thousand, four hundred thirty-two".