212131235 has 4 divisors (see below), whose sum is σ = 254557488. Its totient is φ = 169704984.

The previous prime is 212131229. The next prime is 212131247. The reversal of 212131235 is 532131212.

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-212131235 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21213119 + ... + 21213128.

It is an arithmetic number, because the mean of its divisors is an integer number (63639372).

Almost surely, 2^212131235 is an apocalyptic number.

212131235 is a deficient number, since it is larger than the sum of its proper divisors (42426253).

212131235 is an equidigital number, since it uses as much as digits as its factorization.

212131235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42426252.

The product of its digits is 360, while the sum is 20.

The square root of 212131235 is about 14564.7257097413. The cubic root of 212131235 is about 596.3962079938.

Adding to 212131235 its reverse (532131212), we get a palindrome (744262447).

The spelling of 212131235 in words is "two hundred twelve million, one hundred thirty-one thousand, two hundred thirty-five".