25001024221 has 4 divisors (see below), whose sum is σ = 25003331100. Its totient is φ = 24998717344.

The previous prime is 25001024183. The next prime is 25001024231. The reversal of 25001024221 is 12242010052.

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 5911456996 + 19089567225 = 76886^2 + 138165^2 .

It is a cyclic number.

It is not a de Polignac number, because 25001024221 - 2⁷ = 25001024093 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 (25001024231) 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, 1137106 + ... + 1158883.

It is an arithmetic number, because the mean of its divisors is an integer number (6250832775).

Almost surely, 2^25001024221 is an apocalyptic number.

It is an amenable number.

25001024221 is a deficient number, since it is larger than the sum of its proper divisors (2306879).

25001024221 is a wasteful number, since it uses less digits than its factorization.

25001024221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2306878.

The product of its (nonzero) digits is 320, while the sum is 19.

Adding to 25001024221 its reverse (12242010052), we get a palindrome (37243034273).

The spelling of 25001024221 in words is "twenty-five billion, one million, twenty-four thousand, two hundred twenty-one".