225121213 has 4 divisors (see below), whose sum is σ = 225643968. Its totient is φ = 224598460.

The previous prime is 225121207. The next prime is 225121231. The reversal of 225121213 is 312121522.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 312121522 = 2 ⋅156060761.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225121213 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 (225121313) 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, 260731 + ... + 261592.

It is an arithmetic number, because the mean of its divisors is an integer number (56410992).

Almost surely, 2^225121213 is an apocalyptic number.

It is an amenable number.

225121213 is a deficient number, since it is larger than the sum of its proper divisors (522755).

225121213 is an equidigital number, since it uses as much as digits as its factorization.

225121213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522754.

The product of its digits is 240, while the sum is 19.

The square root of 225121213 is about 15004.0398893098. The cubic root of 225121213 is about 608.3294009796.

Adding to 225121213 its reverse (312121522), we get a palindrome (537242735).

The spelling of 225121213 in words is "two hundred twenty-five million, one hundred twenty-one thousand, two hundred thirteen".