21224289984 has 56 divisors (see below), whose sum is σ = 56500532160. Its totient is φ = 7031349504.

The previous prime is 21224289979. The next prime is 21224290007. The reversal of 21224289984 is 48998242212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307794 + ... + 370385.

Almost surely, 2^21224289984 is an apocalyptic number.

21224289984 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21224289984 is an abundant number, since it is smaller than the sum of its proper divisors (35276242176).

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

21224289984 is a wasteful number, since it uses less digits than its factorization.

21224289984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678357 (or 678347 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 51.

The spelling of 21224289984 in words is "twenty-one billion, two hundred twenty-four million, two hundred eighty-nine thousand, nine hundred eighty-four".