25221423225 has 24 divisors (see below), whose sum is σ = 41708125152. Its totient is φ = 13448617600.

The previous prime is 25221423173. The next prime is 25221423263. The reversal of 25221423225 is 52232412252.

It is a happy number.

It is not a de Polignac number, because 25221423225 - 2⁸ = 25221422969 is a prime.

It is a super-2 number, since 2×25221423225² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25221423192 and 25221423201.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 355309 + ... + 420341.

It is an arithmetic number, because the mean of its divisors is an integer number (1737838548).

Almost surely, 2^25221423225 is an apocalyptic number.

25221423225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25221423225 is a deficient number, since it is larger than the sum of its proper divisors (16486701927).

25221423225 is a wasteful number, since it uses less digits than its factorization.

25221423225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70217 (or 70212 counting only the distinct ones).

The product of its digits is 19200, while the sum is 30.

Adding to 25221423225 its reverse (52232412252), we get a palindrome (77453835477).

The spelling of 25221423225 in words is "twenty-five billion, two hundred twenty-one million, four hundred twenty-three thousand, two hundred twenty-five".