21403631452 has 12 divisors (see below), whose sum is σ = 42807262960. Its totient is φ = 9172984896.

The previous prime is 21403631339. The next prime is 21403631503. The reversal of 21403631452 is 25413630412.

21403631452 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 382207677 + ... + 382207732.

Almost surely, 2^21403631452 is an apocalyptic number.

It is an amenable number.

21403631452 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21403631452 is a wasteful number, since it uses less digits than its factorization.

21403631452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764415420 (or 764415418 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The spelling of 21403631452 in words is "twenty-one billion, four hundred three million, six hundred thirty-one thousand, four hundred fifty-two".