212336431 has 4 divisors (see below), whose sum is σ = 212742952. Its totient is φ = 211929912.

The previous prime is 212336429. The next prime is 212336513. The reversal of 212336431 is 134633212.

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 212336431 - 2¹ = 212336429 is a prime.

It is a super-2 number, since 2×212336431² = 90173519859635522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212336396 and 212336405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212333431) 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, 202476 + ... + 203521.

It is an arithmetic number, because the mean of its divisors is an integer number (53185738).

Almost surely, 2^212336431 is an apocalyptic number.

212336431 is a deficient number, since it is larger than the sum of its proper divisors (406521).

212336431 is an equidigital number, since it uses as much as digits as its factorization.

212336431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406520.

The product of its digits is 2592, while the sum is 25.

The square root of 212336431 is about 14571.7682866562. The cubic root of 212336431 is about 596.5884454051.

Adding to 212336431 its reverse (134633212), we get a palindrome (346969643).

The spelling of 212336431 in words is "two hundred twelve million, three hundred thirty-six thousand, four hundred thirty-one".