25005221 has 4 divisors (see below), whose sum is σ = 25867500. Its totient is φ = 24142944.

The previous prime is 25005191. The next prime is 25005263. The reversal of 25005221 is 12250052.

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 4202500 + 20802721 = 2050^2 + 4561^2 .

It is a cyclic number.

It is not a de Polignac number, because 25005221 - 2¹⁸ = 24743077 is a prime.

It is a super-2 number, since 2×25005221² = 1250522154517682, which contains 22 as substring.

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 25005221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25095221) 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, 431096 + ... + 431153.

It is an arithmetic number, because the mean of its divisors is an integer number (6466875).

Almost surely, 2^25005221 is an apocalyptic number.

It is an amenable number.

25005221 is a deficient number, since it is larger than the sum of its proper divisors (862279).

25005221 is an equidigital number, since it uses as much as digits as its factorization.

25005221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862278.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 25005221 is about 5000.5220727440. The cubic root of 25005221 is about 292.4221274666.

Adding to 25005221 its reverse (12250052), we get a palindrome (37255273).

The spelling of 25005221 in words is "twenty-five million, five thousand, two hundred twenty-one".