212231131 has 4 divisors (see below), whose sum is σ = 242549872. Its totient is φ = 181912392.

The previous prime is 212231119. The next prime is 212231137. The reversal of 212231131 is 131132212.

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

It is a cyclic number.

It is not a de Polignac number, because 212231131 - 2⁷ = 212231003 is a prime.

It is a super-2 number, since 2×212231131² = 90084105931078322, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (212231137) 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, 15159360 + ... + 15159373.

It is an arithmetic number, because the mean of its divisors is an integer number (60637468).

Almost surely, 2^212231131 is an apocalyptic number.

212231131 is a deficient number, since it is larger than the sum of its proper divisors (30318741).

212231131 is an equidigital number, since it uses as much as digits as its factorization.

212231131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30318740.

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

The square root of 212231131 is about 14568.1546875368. The cubic root of 212231131 is about 596.4898108148.

Adding to 212231131 its reverse (131132212), we get a palindrome (343363343).

The spelling of 212231131 in words is "two hundred twelve million, two hundred thirty-one thousand, one hundred thirty-one".