212143403 has 4 divisors (see below), whose sum is σ = 213315648. Its totient is φ = 210971160.

The previous prime is 212143367. The next prime is 212143411. The reversal of 212143403 is 304341212.

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 212143403 - 2⁶ = 212143339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212143423) 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, 585851 + ... + 586212.

It is an arithmetic number, because the mean of its divisors is an integer number (53328912).

Almost surely, 2^212143403 is an apocalyptic number.

212143403 is a deficient number, since it is larger than the sum of its proper divisors (1172245).

212143403 is a wasteful number, since it uses less digits than its factorization.

212143403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1172244.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 212143403 is about 14565.1434253151. The cubic root of 212143403 is about 596.4076110141.

Adding to 212143403 its reverse (304341212), we get a palindrome (516484615).

The spelling of 212143403 in words is "two hundred twelve million, one hundred forty-three thousand, four hundred three".