212122431 has 6 divisors (see below), whose sum is σ = 306399080. Its totient is φ = 141414948.

The previous prime is 212122381. The next prime is 212122433. The reversal of 212122431 is 134221212.

It is a happy number.

212122431 is a `hidden beast` number, since 21 + 212 + 2 + 431 = 666.

It is not a de Polignac number, because 212122431 - 2⁹ = 212121919 is a prime.

It is a super-2 number, since 2×212122431² = 89991851466699522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212122433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11784571 + ... + 11784588.

Almost surely, 2^212122431 is an apocalyptic number.

212122431 is a deficient number, since it is larger than the sum of its proper divisors (94276649).

212122431 is a wasteful number, since it uses less digits than its factorization.

212122431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23569165 (or 23569162 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 212122431 is about 14564.4234695370. The cubic root of 212122431 is about 596.3879572132.

Adding to 212122431 its reverse (134221212), we get a palindrome (346343643).

The spelling of 212122431 in words is "two hundred twelve million, one hundred twenty-two thousand, four hundred thirty-one".