212031331 has 4 divisors (see below), whose sum is σ = 213435664. Its totient is φ = 210627000.

The previous prime is 212031311. The next prime is 212031343. The reversal of 212031331 is 133130212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212031331 is a prime.

It is a super-2 number, since 2×212031331² = 89914570651263122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212031311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 701940 + ... + 702241.

It is an arithmetic number, because the mean of its divisors is an integer number (53358916).

Almost surely, 2^212031331 is an apocalyptic number.

212031331 is a deficient number, since it is larger than the sum of its proper divisors (1404333).

212031331 is a wasteful number, since it uses less digits than its factorization.

212031331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1404332.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 212031331 is about 14561.2956497696. The cubic root of 212031331 is about 596.3025682826.

Adding to 212031331 its reverse (133130212), we get a palindrome (345161543).

The spelling of 212031331 in words is "two hundred twelve million, thirty-one thousand, three hundred thirty-one".