203131220101 has 2 divisors, whose sum is σ = 203131220102. Its totient is φ = 203131220100.

The previous prime is 203131220081. The next prime is 203131220107. The reversal of 203131220101 is 101022131302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140343890625 + 62787329476 = 374625^2 + 250574^2 .

It is a cyclic number.

It is not a de Polignac number, because 203131220101 - 2¹¹ = 203131218053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203131220107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101565610050 + 101565610051.

It is an arithmetic number, because the mean of its divisors is an integer number (101565610051).

Almost surely, 2^203131220101 is an apocalyptic number.

It is an amenable number.

203131220101 is a deficient number, since it is larger than the sum of its proper divisors (1).

203131220101 is an equidigital number, since it uses as much as digits as its factorization.

203131220101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 203131220101 its reverse (101022131302), we get a palindrome (304153351403).

The spelling of 203131220101 in words is "two hundred three billion, one hundred thirty-one million, two hundred twenty thousand, one hundred one".