25425222221 has 16 divisors (see below), whose sum is σ = 29519293440. Its totient is φ = 21449111040.

The previous prime is 25425222217. The next prime is 25425222223. The reversal of 25425222221 is 12222252452.

It is not a de Polignac number, because 25425222221 - 2² = 25425222217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25425222223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19460 + ... + 226338.

It is an arithmetic number, because the mean of its divisors is an integer number (1844955840).

Almost surely, 2^25425222221 is an apocalyptic number.

It is an amenable number.

25425222221 is a deficient number, since it is larger than the sum of its proper divisors (4094071219).

25425222221 is a wasteful number, since it uses less digits than its factorization.

25425222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207164.

The product of its digits is 12800, while the sum is 29.

Adding to 25425222221 its reverse (12222252452), we get a palindrome (37647474673).

The spelling of 25425222221 in words is "twenty-five billion, four hundred twenty-five million, two hundred twenty-two thousand, two hundred twenty-one".