21576449984 has 28 divisors (see below), whose sum is σ = 43402294704. Its totient is φ = 10640438784.

The previous prime is 21576449977. The next prime is 21576450053. The reversal of 21576449984 is 48994467512.

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, 2304452 + ... + 2313795.

Almost surely, 2^21576449984 is an apocalyptic number.

It is an amenable number.

21576449984 is an abundant number, since it is smaller than the sum of its proper divisors (21825844720).

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

21576449984 is an equidigital number, since it uses as much as digits as its factorization.

21576449984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4618332 (or 4618322 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 59.

The spelling of 21576449984 in words is "twenty-one billion, five hundred seventy-six million, four hundred forty-nine thousand, nine hundred eighty-four".