21404402432 has 72 divisors (see below), whose sum is σ = 51701148576. Its totient is φ = 8633696256.

The previous prime is 21404402419. The next prime is 21404402441. The reversal of 21404402432 is 23420440412.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 320843 + ... + 381770.

It is an arithmetic number, because the mean of its divisors is an integer number (718071508).

Almost surely, 2^21404402432 is an apocalyptic number.

It is an amenable number.

21404402432 is an abundant number, since it is smaller than the sum of its proper divisors (30296746144).

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

21404402432 is an equidigital number, since it uses as much as digits as its factorization.

21404402432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702653 (or 702639 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 26.

Adding to 21404402432 its reverse (23420440412), we get a palindrome (44824842844).

The spelling of 21404402432 in words is "twenty-one billion, four hundred four million, four hundred two thousand, four hundred thirty-two".