203131103200021 has 2 divisors, whose sum is σ = 203131103200022. Its totient is φ = 203131103200020.

The previous prime is 203131103199917. The next prime is 203131103200057. The reversal of 203131103200021 is 120002301131302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196170529075921 + 6960574124100 = 14006089^2 + 2638290^2 .

It is a cyclic number.

It is not a de Polignac number, because 203131103200021 - 2¹¹ = 203131103197973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203131103206021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101565551600010 + 101565551600011.

It is an arithmetic number, because the mean of its divisors is an integer number (101565551600011).

Almost surely, 2^{203131103200021} is an apocalyptic number.

It is an amenable number.

203131103200021 is a deficient number, since it is larger than the sum of its proper divisors (1).

203131103200021 is an equidigital number, since it uses as much as digits as its factorization.

203131103200021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 203131103200021 its reverse (120002301131302), we get a palindrome (323133404331323).

The spelling of 203131103200021 in words is "two hundred three trillion, one hundred thirty-one billion, one hundred three million, two hundred thousand, twenty-one".