25134432221 has 4 divisors (see below), whose sum is σ = 26612928252. Its totient is φ = 23655936192.

The previous prime is 25134432173. The next prime is 25134432229. The reversal of 25134432221 is 12223443152.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11459702500 + 13674729721 = 107050^2 + 116939^2 .

It is a cyclic number.

It is not a de Polignac number, because 25134432221 - 2¹⁴ = 25134415837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25134432229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 739247990 + ... + 739248023.

It is an arithmetic number, because the mean of its divisors is an integer number (6653232063).

Almost surely, 2^25134432221 is an apocalyptic number.

It is an amenable number.

25134432221 is a deficient number, since it is larger than the sum of its proper divisors (1478496031).

25134432221 is a wasteful number, since it uses less digits than its factorization.

25134432221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1478496030.

The product of its digits is 11520, while the sum is 29.

Adding to 25134432221 its reverse (12223443152), we get a palindrome (37357875373).

The spelling of 25134432221 in words is "twenty-five billion, one hundred thirty-four million, four hundred thirty-two thousand, two hundred twenty-one".