21487624228 has 12 divisors (see below), whose sum is σ = 42975248512. Its totient is φ = 9208981800.

The previous prime is 21487624201. The next prime is 21487624247. The reversal of 21487624228 is 82242678412.

It is a happy number.

21487624228 is an admirable number.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

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, 383707548 + ... + 383707603.

Almost surely, 2^21487624228 is an apocalyptic number.

21487624228 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21487624228 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.

21487624228 is a wasteful number, since it uses less digits than its factorization.

21487624228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 767415162 (or 767415160 counting only the distinct ones).

The product of its digits is 688128, while the sum is 46.

The spelling of 21487624228 in words is "twenty-one billion, four hundred eighty-seven million, six hundred twenty-four thousand, two hundred twenty-eight".