21223503504 has 60 divisors (see below), whose sum is σ = 67881526336. Its totient is φ = 6063857856.

The previous prime is 21223503493. The next prime is 21223503523. The reversal of 21223503504 is 40530532212.

It is a happy number.

21223503504 is a `hidden beast` number, since 2 + 122 + 35 + 0 + 3 + 504 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10526524 + ... + 10528539.

Almost surely, 2^21223503504 is an apocalyptic number.

21223503504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21223503504 is an abundant number, since it is smaller than the sum of its proper divisors (46658022832).

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

21223503504 is a wasteful number, since it uses less digits than its factorization.

21223503504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21055084 (or 21055075 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The spelling of 21223503504 in words is "twenty-one billion, two hundred twenty-three million, five hundred three thousand, five hundred four".