212131231 has 8 divisors (see below), whose sum is σ = 238381920. Its totient is φ = 187299552.

The previous prime is 212131229. The next prime is 212131247. The reversal of 212131231 is 132131212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212131231 - 2¹ = 212131229 is a prime.

It is a super-2 number, since 2×212131231² = 89999318331150722, 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 (212131261) 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 7 ways as a sum of consecutive naturals, for example, 354436 + ... + 355033.

It is an arithmetic number, because the mean of its divisors is an integer number (29797740).

Almost surely, 2^212131231 is an apocalyptic number.

212131231 is a deficient number, since it is larger than the sum of its proper divisors (26250689).

212131231 is a wasteful number, since it uses less digits than its factorization.

212131231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 709505.

The product of its digits is 72, while the sum is 16.

The square root of 212131231 is about 14564.7255724233. The cubic root of 212131231 is about 596.3962042452.

Adding to 212131231 its reverse (132131212), we get a palindrome (344262443).

The spelling of 212131231 in words is "two hundred twelve million, one hundred thirty-one thousand, two hundred thirty-one".