21288993472 has 28 divisors (see below), whose sum is σ = 42251493856. Its totient is φ = 10642947840.

The previous prime is 21288993449. The next prime is 21288993491. The reversal of 21288993472 is 27439988212.

It is a super-2 number, since 2×21288993472² (a number of 21 digits) contains 22 as substring.

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, 510697 + ... + 550807.

Almost surely, 2^21288993472 is an apocalyptic number.

It is an amenable number.

21288993472 is a deficient number, since it is larger than the sum of its proper divisors (20962500384).

21288993472 is an equidigital number, since it uses as much as digits as its factorization.

21288993472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48416 (or 48406 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 55.

The spelling of 21288993472 in words is "twenty-one billion, two hundred eighty-eight million, nine hundred ninety-three thousand, four hundred seventy-two".