25100521221 has 16 divisors (see below), whose sum is σ = 34191166464. Its totient is φ = 16372023024.

The previous prime is 25100521219. The next prime is 25100521231. The reversal of 25100521221 is 12212500152.

It is not a de Polignac number, because 25100521221 - 2¹ = 25100521219 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25100521211) 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 15 ways as a sum of consecutive naturals, for example, 403426 + ... + 461468.

It is an arithmetic number, because the mean of its divisors is an integer number (2136947904).

Almost surely, 2^25100521221 is an apocalyptic number.

It is an amenable number.

25100521221 is a deficient number, since it is larger than the sum of its proper divisors (9090645243).

25100521221 is a wasteful number, since it uses less digits than its factorization.

25100521221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61160.

The product of its (nonzero) digits is 400, while the sum is 21.

The spelling of 25100521221 in words is "twenty-five billion, one hundred million, five hundred twenty-one thousand, two hundred twenty-one".