25213221 has 32 divisors (see below), whose sum is σ = 42531840. Its totient is φ = 14612400.

The previous prime is 25213219. The next prime is 25213241. The reversal of 25213221 is 12231252.

It is not a de Polignac number, because 25213221 - 2¹ = 25213219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25213194 and 25213203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25213211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4986 + ... + 8676.

It is an arithmetic number, because the mean of its divisors is an integer number (1329120).

Almost surely, 2^25213221 is an apocalyptic number.

It is an amenable number.

25213221 is a deficient number, since it is larger than the sum of its proper divisors (17318619).

25213221 is a wasteful number, since it uses less digits than its factorization.

25213221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3734 (or 3728 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 25213221 is about 5021.2768296520. The cubic root of 25213221 is about 293.2307043118.

Adding to 25213221 its reverse (12231252), we get a palindrome (37444473).

The spelling of 25213221 in words is "twenty-five million, two hundred thirteen thousand, two hundred twenty-one".