21996285744025 has 6 divisors (see below), whose sum is σ = 27275394322622. Its totient is φ = 17597028595200.

The previous prime is 21996285744007. The next prime is 21996285744029. The reversal of 21996285744025 is 52044758269912.

It can be written as a sum of positive squares in 3 ways, for example, as 19429293321 + 21976856450704 = 139389^2 + 4687948^2 .

It is not a de Polignac number, because 21996285744025 - 2²¹ = 21996283646873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21996285744029) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 439925714856 + ... + 439925714905.

Almost surely, 2^{21996285744025} is an apocalyptic number.

21996285744025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21996285744025 is a deficient number, since it is larger than the sum of its proper divisors (5279108578597).

21996285744025 is an equidigital number, since it uses as much as digits as its factorization.

21996285744025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879851429771 (or 879851429766 counting only the distinct ones).

The product of its (nonzero) digits is 87091200, while the sum is 64.

The spelling of 21996285744025 in words is "twenty-one trillion, nine hundred ninety-six billion, two hundred eighty-five million, seven hundred forty-four thousand, twenty-five".