203121010231213 has 2 divisors, whose sum is σ = 203121010231214. Its totient is φ = 203121010231212.

The previous prime is 203121010231199. The next prime is 203121010231231. The reversal of 203121010231213 is 312132010121302.

Together with next prime (203121010231231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147056901396804 + 56064108834409 = 12126702^2 + 7487597^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203121010231213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203121010231253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101560505115606 + 101560505115607.

It is an arithmetic number, because the mean of its divisors is an integer number (101560505115607).

Almost surely, 2^{203121010231213} is an apocalyptic number.

It is an amenable number.

203121010231213 is a deficient number, since it is larger than the sum of its proper divisors (1).

203121010231213 is an equidigital number, since it uses as much as digits as its factorization.

203121010231213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 203121010231213 its reverse (312132010121302), we get a palindrome (515253020352515).

The spelling of 203121010231213 in words is "two hundred three trillion, one hundred twenty-one billion, ten million, two hundred thirty-one thousand, two hundred thirteen".