215320252 has 24 divisors (see below), whose sum is σ = 431133696. Its totient is φ = 92174448.

The previous prime is 215320223. The next prime is 215320253. The reversal of 215320252 is 252023512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215320253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23613 + ... + 31435.

It is an arithmetic number, because the mean of its divisors is an integer number (17963904).

Almost surely, 2^215320252 is an apocalyptic number.

It is an amenable number.

215320252 is an abundant number, since it is smaller than the sum of its proper divisors (215813444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215320252 is a wasteful number, since it uses less digits than its factorization.

215320252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8817 (or 8815 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 215320252 is about 14673.7947375585. The cubic root of 215320252 is about 599.3699423141.

Adding to 215320252 its reverse (252023512), we get a palindrome (467343764).

The spelling of 215320252 in words is "two hundred fifteen million, three hundred twenty thousand, two hundred fifty-two".