25266221 has 4 divisors (see below), whose sum is σ = 26137500. Its totient is φ = 24394944.

The previous prime is 25266211. The next prime is 25266247. The reversal of 25266221 is 12266252.

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 11464996 + 13801225 = 3386^2 + 3715^2 .

It is a cyclic number.

It is not a de Polignac number, because 25266221 - 2¹⁰ = 25265197 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 (25266211) 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, 435596 + ... + 435653.

It is an arithmetic number, because the mean of its divisors is an integer number (6534375).

Almost surely, 2^25266221 is an apocalyptic number.

It is an amenable number.

25266221 is a deficient number, since it is larger than the sum of its proper divisors (871279).

25266221 is an equidigital number, since it uses as much as digits as its factorization.

25266221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871278.

The product of its digits is 2880, while the sum is 26.

The square root of 25266221 is about 5026.5516012471. The cubic root of 25266221 is about 293.4360245079.

The spelling of 25266221 in words is "twenty-five million, two hundred sixty-six thousand, two hundred twenty-one".