21964722025 has 9 divisors (see below), whose sum is σ = 27237174213. Its totient is φ = 17571184800.

The previous prime is 21964722011. The next prime is 21964722067. The reversal of 21964722025 is 52022746912.

The square root of 21964722025 is 148205.

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

It can be written as a sum of positive squares in 4 ways, for example, as 3500260569 + 18464461456 = 59163^2 + 135884^2 .

It is not a de Polignac number, because 21964722025 - 2¹³ = 21964713833 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 726205 + ... + 755845.

Almost surely, 2^21964722025 is an apocalyptic number.

21964722025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21964722025 is the 148205-th square number.

21964722025 is the 74103-rd centered octagonal number.

It is an amenable number.

21964722025 is a deficient number, since it is larger than the sum of its proper divisors (5272452188).

21964722025 is an frugal number, since it uses more digits than its factorization.

21964722025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59292 (or 29646 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 21964722025 in words is "twenty-one billion, nine hundred sixty-four million, seven hundred twenty-two thousand, twenty-five".