212403031 has 4 divisors (see below), whose sum is σ = 213045064. Its totient is φ = 211761000.

The previous prime is 212403029. The next prime is 212403053. The reversal of 212403031 is 130304212.

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 212403031 - 2¹ = 212403029 is a prime.

It is a super-2 number, since 2×212403031² = 90230095155973922, 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 = 212402996 and 212403014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212403431) 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 3 ways as a sum of consecutive naturals, for example, 320520 + ... + 321181.

It is an arithmetic number, because the mean of its divisors is an integer number (53261266).

Almost surely, 2^212403031 is an apocalyptic number.

212403031 is a deficient number, since it is larger than the sum of its proper divisors (642033).

212403031 is an equidigital number, since it uses as much as digits as its factorization.

212403031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642032.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 212403031 is about 14574.0533483311. The cubic root of 212403031 is about 596.6508128423.

Adding to 212403031 its reverse (130304212), we get a palindrome (342707243).

The spelling of 212403031 in words is "two hundred twelve million, four hundred three thousand, thirty-one".