212031403 has 4 divisors (see below), whose sum is σ = 212713488. Its totient is φ = 211349320.

The previous prime is 212031401. The next prime is 212031419. The reversal of 212031403 is 304130212.

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 212031403 - 2¹ = 212031401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212031401) 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, 340576 + ... + 341197.

It is an arithmetic number, because the mean of its divisors is an integer number (53178372).

Almost surely, 2^212031403 is an apocalyptic number.

212031403 is a deficient number, since it is larger than the sum of its proper divisors (682085).

212031403 is an equidigital number, since it uses as much as digits as its factorization.

212031403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682084.

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

The square root of 212031403 is about 14561.2981220769. The cubic root of 212031403 is about 596.3026357786.

Adding to 212031403 its reverse (304130212), we get a palindrome (516161615).

The spelling of 212031403 in words is "two hundred twelve million, thirty-one thousand, four hundred three".