25430221 has 4 divisors (see below), whose sum is σ = 25541500. Its totient is φ = 25318944.

The previous prime is 25430213. The next prime is 25430233. The reversal of 25430221 is 12203452.

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 21288996 + 4141225 = 4614^2 + 2035^2 .

It is a cyclic number.

It is not a de Polignac number, because 25430221 - 2³ = 25430213 is a prime.

It is a super-2 number, since 2×25430221² = 1293392280217682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25430281) 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, 55296 + ... + 55753.

It is an arithmetic number, because the mean of its divisors is an integer number (6385375).

Almost surely, 2^25430221 is an apocalyptic number.

It is an amenable number.

25430221 is a deficient number, since it is larger than the sum of its proper divisors (111279).

25430221 is a wasteful number, since it uses less digits than its factorization.

25430221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111278.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 25430221 is about 5042.8385855587. The cubic root of 25430221 is about 294.0695417583.

Adding to 25430221 its reverse (12203452), we get a palindrome (37633673).

It can be divided in two parts, 25430 and 221, that added together give a triangular number (25651 = T₂₂₆).

The spelling of 25430221 in words is "twenty-five million, four hundred thirty thousand, two hundred twenty-one".