25042225221 has 64 divisors (see below), whose sum is σ = 40991408640. Its totient is φ = 15011412480.

The previous prime is 25042225199. The next prime is 25042225297. The reversal of 25042225221 is 12252224052.

It is a happy number.

It is not a de Polignac number, because 25042225221 - 2⁶ = 25042225157 is a prime.

It is a super-2 number, since 2×25042225221² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25042225421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15296815 + ... + 15298451.

It is an arithmetic number, because the mean of its divisors is an integer number (640490760).

Almost surely, 2^25042225221 is an apocalyptic number.

It is an amenable number.

25042225221 is a deficient number, since it is larger than the sum of its proper divisors (15949183419).

25042225221 is a wasteful number, since it uses less digits than its factorization.

25042225221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2763 (or 2757 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

Adding to 25042225221 its reverse (12252224052), we get a palindrome (37294449273).

The spelling of 25042225221 in words is "twenty-five billion, forty-two million, two hundred twenty-five thousand, two hundred twenty-one".