212331330 has 48 divisors (see below), whose sum is σ = 571105080. Its totient is φ = 54668544.

The previous prime is 212331323. The next prime is 212331349. The reversal of 212331330 is 33133212.

212331330 is a `hidden beast` number, since 2 + 1 + 2 + 331 + 330 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 193849929 + 18481401 = 13923^2 + 4299^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38067 + ... + 43286.

Almost surely, 2^212331330 is an apocalyptic number.

212331330 is an abundant number, since it is smaller than the sum of its proper divisors (358773750).

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

212331330 is a wasteful number, since it uses less digits than its factorization.

212331330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81395 (or 81392 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

The square root of 212331330 is about 14571.5932553719. The cubic root of 212331330 is about 596.5836680462.

Adding to 212331330 its reverse (33133212), we get a palindrome (245464542).

The spelling of 212331330 in words is "two hundred twelve million, three hundred thirty-one thousand, three hundred thirty".