201231203213 has 4 divisors (see below), whose sum is σ = 202512930780. Its totient is φ = 199949475648.

The previous prime is 201231203197. The next prime is 201231203237. The reversal of 201231203213 is 312302132102.

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 37078198249 + 164153004964 = 192557^2 + 405158^2 .

It is a cyclic number.

It is not a de Polignac number, because 201231203213 - 2⁴ = 201231203197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201231203293) 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, 640863548 + ... + 640863861.

It is an arithmetic number, because the mean of its divisors is an integer number (50628232695).

Almost surely, 2^201231203213 is an apocalyptic number.

It is an amenable number.

201231203213 is a deficient number, since it is larger than the sum of its proper divisors (1281727567).

201231203213 is a wasteful number, since it uses less digits than its factorization.

201231203213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1281727566.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 201231203213 its reverse (312302132102), we get a palindrome (513533335315).

The spelling of 201231203213 in words is "two hundred one billion, two hundred thirty-one million, two hundred three thousand, two hundred thirteen".