212131131 has 4 divisors (see below), whose sum is σ = 282841512. Its totient is φ = 141420752.

The previous prime is 212131123. The next prime is 212131133. The reversal of 212131131 is 131131212.

It is a happy number.

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 212131131 - 2³ = 212131123 is a prime.

It is a super-2 number, since 2×212131131² = 89999233478678322, 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 212131131.

It is not an unprimeable number, because it can be changed into a prime (212131133) 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, 35355186 + ... + 35355191.

It is an arithmetic number, because the mean of its divisors is an integer number (70710378).

Almost surely, 2^212131131 is an apocalyptic number.

212131131 is a deficient number, since it is larger than the sum of its proper divisors (70710381).

212131131 is an equidigital number, since it uses as much as digits as its factorization.

212131131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70710380.

The product of its digits is 36, while the sum is 15.

The square root of 212131131 is about 14564.7221394711. The cubic root of 212131131 is about 596.3961105302.

Adding to 212131131 its reverse (131131212), we get a palindrome (343262343).

It can be divided in two parts, 212 and 131131, that multiplied together give a palindrome (27799772).

The spelling of 212131131 in words is "two hundred twelve million, one hundred thirty-one thousand, one hundred thirty-one".