21722010725 has 24 divisors (see below), whose sum is σ = 27038139240. Its totient is φ = 17311392000.

The previous prime is 21722010721. The next prime is 21722010749. The reversal of 21722010725 is 52701022712.

It can be written as a sum of positive squares in 12 ways, for example, as 21705834241 + 16176484 = 147329^2 + 4022^2 .

It is not a de Polignac number, because 21722010725 - 2² = 21722010721 is a prime.

It is a super-3 number, since 3×21722010725³ (a number of 32 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21722010721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11671295 + ... + 11673155.

It is an arithmetic number, because the mean of its divisors is an integer number (1126589135).

Almost surely, 2^21722010725 is an apocalyptic number.

21722010725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21722010725 is a deficient number, since it is larger than the sum of its proper divisors (5316128515).

21722010725 is a wasteful number, since it uses less digits than its factorization.

21722010725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3401 (or 3396 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 29.

The spelling of 21722010725 in words is "twenty-one billion, seven hundred twenty-two million, ten thousand, seven hundred twenty-five".