25121213 has 4 divisors (see below), whose sum is σ = 27053628. Its totient is φ = 23188800.

The previous prime is 25121209. The next prime is 25121227. The reversal of 25121213 is 31212152.

It is a happy number.

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 4853209 + 20268004 = 2203^2 + 4502^2 .

It is a cyclic number.

It is not a de Polignac number, because 25121213 - 2² = 25121209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25121191 and 25121200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25121263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 966188 + ... + 966213.

It is an arithmetic number, because the mean of its divisors is an integer number (6763407).

Almost surely, 2^25121213 is an apocalyptic number.

It is an amenable number.

25121213 is a deficient number, since it is larger than the sum of its proper divisors (1932415).

25121213 is a wasteful number, since it uses less digits than its factorization.

25121213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1932414.

The product of its digits is 120, while the sum is 17.

The square root of 25121213 is about 5012.1066429197. The cubic root of 25121213 is about 292.8735840632.

Adding to 25121213 its reverse (31212152), we get a palindrome (56333365).

It can be divided in two parts, 2 and 5121213, that added together give a palindrome (5121215).

The spelling of 25121213 in words is "twenty-five million, one hundred twenty-one thousand, two hundred thirteen".