25211121 has 16 divisors (see below), whose sum is σ = 37450560. Its totient is φ = 14978880.

The previous prime is 25211107. The next prime is 25211143. The reversal of 25211121 is 12111252.

It is not a de Polignac number, because 25211121 - 2⁶ = 25211057 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 25211121.

It is not an unprimeable number, because it can be changed into a prime (25211161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10015 + ... + 12276.

It is an arithmetic number, because the mean of its divisors is an integer number (2340660).

Almost surely, 2^25211121 is an apocalyptic number.

It is an amenable number.

25211121 is a deficient number, since it is larger than the sum of its proper divisors (12239439).

25211121 is a wasteful number, since it uses less digits than its factorization.

25211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22336.

The product of its digits is 40, while the sum is 15.

The square root of 25211121 is about 5021.0677151379. The cubic root of 25211121 is about 293.2225630596. Note that the first 3 decimals are identical.

Adding to 25211121 its reverse (12111252), we get a palindrome (37322373).

The spelling of 25211121 in words is "twenty-five million, two hundred eleven thousand, one hundred twenty-one".