212151231 has 20 divisors (see below), whose sum is σ = 317310400. Its totient is φ = 141258816.

The previous prime is 212151227. The next prime is 212151239. The reversal of 212151231 is 132151212.

212151231 is a `hidden beast` number, since 2 + 121 + 512 + 31 = 666.

It is not a de Polignac number, because 212151231 - 2² = 212151227 is a prime.

It is a super-2 number, since 2×212151231² = 90016289629630722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212151239) 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 19 ways as a sum of consecutive naturals, for example, 119730 + ... + 121488.

It is an arithmetic number, because the mean of its divisors is an integer number (15865520).

Almost surely, 2^212151231 is an apocalyptic number.

212151231 is a deficient number, since it is larger than the sum of its proper divisors (105159169).

212151231 is a wasteful number, since it uses less digits than its factorization.

212151231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3260 (or 3251 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 212151231 is about 14565.4121465889. The cubic root of 212151231 is about 596.4149466516.

The spelling of 212151231 in words is "two hundred twelve million, one hundred fifty-one thousand, two hundred thirty-one".