25033450221 has 40 divisors (see below), whose sum is σ = 40289181240. Its totient is φ = 15398719488.

The previous prime is 25033450207. The next prime is 25033450261. The reversal of 25033450221 is 12205433052.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2791008900 + 22242441321 = 52830^2 + 149139^2 .

It is a de Polignac number, because none of the positive numbers 2^k-25033450221 is a prime.

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 (25033450261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4092061 + ... + 4098173.

It is an arithmetic number, because the mean of its divisors is an integer number (1007229531).

Almost surely, 2^25033450221 is an apocalyptic number.

It is an amenable number.

25033450221 is a deficient number, since it is larger than the sum of its proper divisors (15255731019).

25033450221 is a wasteful number, since it uses less digits than its factorization.

25033450221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10027 (or 10018 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

Adding to 25033450221 its reverse (12205433052), we get a palindrome (37238883273).

The spelling of 25033450221 in words is "twenty-five billion, thirty-three million, four hundred fifty thousand, two hundred twenty-one".