25425032221 has 8 divisors (see below), whose sum is σ = 27012616920. Its totient is φ = 23884838208.

The previous prime is 25425032207. The next prime is 25425032257. The reversal of 25425032221 is 12223052452.

It can be written as a sum of positive squares in 4 ways, for example, as 3377236996 + 22047795225 = 58114^2 + 148485^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25425032221 - 2⁷ = 25425032093 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25425032221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25425032201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11846566 + ... + 11848711.

It is an arithmetic number, because the mean of its divisors is an integer number (3376577115).

Almost surely, 2^25425032221 is an apocalyptic number.

It is an amenable number.

25425032221 is a deficient number, since it is larger than the sum of its proper divisors (1587584699).

25425032221 is a wasteful number, since it uses less digits than its factorization.

25425032221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23695343.

The product of its (nonzero) digits is 9600, while the sum is 28.

Adding to 25425032221 its reverse (12223052452), we get a palindrome (37648084673).

The spelling of 25425032221 in words is "twenty-five billion, four hundred twenty-five million, thirty-two thousand, two hundred twenty-one".