212231031 has 8 divisors (see below), whose sum is σ = 283590384. Its totient is φ = 141179520.

The previous prime is 212231023. The next prime is 212231059. The reversal of 212231031 is 130132212.

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

It is not a de Polignac number, because 212231031 - 2³ = 212231023 is a prime.

It is a super-2 number, since 2×212231031² = 90084021038645922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 212231031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212231011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75346 + ... + 78111.

It is an arithmetic number, because the mean of its divisors is an integer number (35448798).

Almost surely, 2^212231031 is an apocalyptic number.

212231031 is a deficient number, since it is larger than the sum of its proper divisors (71359353).

212231031 is a wasteful number, since it uses less digits than its factorization.

212231031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153921.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 212231031 is about 14568.1512553927. The cubic root of 212231031 is about 596.4897171292.

Adding to 212231031 its reverse (130132212), we get a palindrome (342363243).

It can be divided in two parts, 2122 and 31031, that added together give a triangular number (33153 = T₂₅₇).

The spelling of 212231031 in words is "two hundred twelve million, two hundred thirty-one thousand, thirty-one".