21964425616 has 135 divisors (see below), whose sum is σ = 50898076299. Its totient is φ = 9155450304.

The previous prime is 21964425599. The next prime is 21964425673. The reversal of 21964425616 is 61652446912.

The square root of 21964425616 is 148204.

It is a perfect power (a square), and thus also a powerful number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 278030665 + ... + 278030743.

Almost surely, 2^21964425616 is an apocalyptic number.

21964425616 is the 148204-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21964425616

21964425616 is an abundant number, since it is smaller than the sum of its proper divisors (28933650683).

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

21964425616 is an frugal number, since it uses more digits than its factorization.

21964425616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314 (or 155 counting only the distinct ones).

The product of its digits is 622080, while the sum is 46.

The spelling of 21964425616 in words is "twenty-one billion, nine hundred sixty-four million, four hundred twenty-five thousand, six hundred sixteen".