21455253404 has 12 divisors (see below), whose sum is σ = 40434900744. Its totient is φ = 9902424624.

The previous prime is 21455253389. The next prime is 21455253539. The reversal of 21455253404 is 40435255412.

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, 206300462 + ... + 206300565.

It is an arithmetic number, because the mean of its divisors is an integer number (3369575062).

Almost surely, 2^21455253404 is an apocalyptic number.

It is an amenable number.

21455253404 is a deficient number, since it is larger than the sum of its proper divisors (18979647340).

21455253404 is a wasteful number, since it uses less digits than its factorization.

21455253404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412601044 (or 412601042 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 35.

The spelling of 21455253404 in words is "twenty-one billion, four hundred fifty-five million, two hundred fifty-three thousand, four hundred four".