25213213 has 4 divisors (see below), whose sum is σ = 25688988. Its totient is φ = 24737440.

The previous prime is 25213211. The next prime is 25213217. The reversal of 25213213 is 31231252.

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 13227769 + 11985444 = 3637^2 + 3462^2 .

It is a cyclic number.

It is not a de Polignac number, because 25213213 - 2¹ = 25213211 is a prime.

It is a super-2 number, since 2×25213213² = 1271412219566738, 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 (25213211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 237808 + ... + 237913.

It is an arithmetic number, because the mean of its divisors is an integer number (6422247).

Almost surely, 2^25213213 is an apocalyptic number.

It is an amenable number.

25213213 is a deficient number, since it is larger than the sum of its proper divisors (475775).

25213213 is an equidigital number, since it uses as much as digits as its factorization.

25213213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475774.

The product of its digits is 360, while the sum is 19.

The square root of 25213213 is about 5021.2760330418. The cubic root of 25213213 is about 293.2306732984.

Adding to 25213213 its reverse (31231252), we get a palindrome (56444465).

The spelling of 25213213 in words is "twenty-five million, two hundred thirteen thousand, two hundred thirteen".