203210021213 has 4 divisors (see below), whose sum is σ = 203287673820. Its totient is φ = 203132368608.

The previous prime is 203210021177. The next prime is 203210021243. The reversal of 203210021213 is 312120012302.

203210021213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 179671711129 + 23538310084 = 423877^2 + 153422^2 .

It is a cyclic number.

It is not a de Polignac number, because 203210021213 - 2¹² = 203210017117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 203210021191 and 203210021200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203210021243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38822378 + ... + 38827611.

It is an arithmetic number, because the mean of its divisors is an integer number (50821918455).

Almost surely, 2^203210021213 is an apocalyptic number.

It is an amenable number.

203210021213 is a deficient number, since it is larger than the sum of its proper divisors (77652607).

203210021213 is an equidigital number, since it uses as much as digits as its factorization.

203210021213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77652606.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 203210021213 its reverse (312120012302), we get a palindrome (515330033515).

The spelling of 203210021213 in words is "two hundred three billion, two hundred ten million, twenty-one thousand, two hundred thirteen".