212240431 has 8 divisors (see below), whose sum is σ = 240596720. Its totient is φ = 185602752.

The previous prime is 212240417. The next prime is 212240437. The reversal of 212240431 is 134042212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212240431 - 2²⁵ = 178685999 is a prime.

It is a super-2 number, since 2×212240431² = 90092001102131522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a junction number, because it is equal to n+sod(n) for n = 212240399 and 212240408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212240437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 429390 + ... + 429883.

It is an arithmetic number, because the mean of its divisors is an integer number (30074590).

Almost surely, 2^212240431 is an apocalyptic number.

212240431 is a deficient number, since it is larger than the sum of its proper divisors (28356289).

212240431 is a wasteful number, since it uses less digits than its factorization.

212240431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859305.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 212240431 is about 14568.4738734021. The cubic root of 212240431 is about 596.4985234452.

Adding to 212240431 its reverse (134042212), we get a palindrome (346282643).

The spelling of 212240431 in words is "two hundred twelve million, two hundred forty thousand, four hundred thirty-one".