21629966448 has 80 divisors (see below), whose sum is σ = 58098379680. Its totient is φ = 6925943808.

The previous prime is 21629966399. The next prime is 21629966483. The reversal of 21629966448 is 84466992612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 234786 + ... + 313662.

It is an arithmetic number, because the mean of its divisors is an integer number (726229746).

Almost surely, 2^21629966448 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21629966448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29049189840).

21629966448 is an abundant number, since it is smaller than the sum of its proper divisors (36468413232).

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

21629966448 is a wasteful number, since it uses less digits than its factorization.

21629966448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79114 (or 79108 counting only the distinct ones).

The product of its digits is 8957952, while the sum is 57.

The spelling of 21629966448 in words is "twenty-one billion, six hundred twenty-nine million, nine hundred sixty-six thousand, four hundred forty-eight".