21044474880 has 792 divisors, whose sum is σ = 81309394656. Its totient is φ = 4638965760.

The previous prime is 21044474827. The next prime is 21044474897. The reversal of 21044474880 is 8847444012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 314096607 + ... + 314096673.

Almost surely, 2^21044474880 is an apocalyptic number.

21044474880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21044474880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40654697328).

21044474880 is an abundant number, since it is smaller than the sum of its proper divisors (60264919776).

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

21044474880 is a wasteful number, since it uses less digits than its factorization.

21044474880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 229376, while the sum is 42.

The spelling of 21044474880 in words is "twenty-one billion, forty-four million, four hundred seventy-four thousand, eight hundred eighty".