215212312 has 24 divisors (see below), whose sum is σ = 469405260. Its totient is φ = 92233680.

The previous prime is 215212279. The next prime is 215212337. The reversal of 215212312 is 213212512.

It is a self number, because there is not a number n which added to its sum of digits gives 215212312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 274114 + ... + 274897.

Almost surely, 2^215212312 is an apocalyptic number.

It is an amenable number.

215212312 is an abundant number, since it is smaller than the sum of its proper divisors (254192948).

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

215212312 is a wasteful number, since it uses less digits than its factorization.

215212312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549031 (or 549020 counting only the distinct ones).

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

The square root of 215212312 is about 14670.1162912909. The cubic root of 215212312 is about 599.2697708956.

Adding to 215212312 its reverse (213212512), we get a palindrome (428424824).

The spelling of 215212312 in words is "two hundred fifteen million, two hundred twelve thousand, three hundred twelve".