203040555121 has 2 divisors, whose sum is σ = 203040555122. Its totient is φ = 203040555120.

The previous prime is 203040555097. The next prime is 203040555169. The reversal of 203040555121 is 121555040302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188606935521 + 14433619600 = 434289^2 + 120140^2 .

It is a cyclic number.

It is not a de Polignac number, because 203040555121 - 2⁵ = 203040555089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 203040555121.

It is not a weakly prime, because it can be changed into another prime (203040555521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101520277560 + 101520277561.

It is an arithmetic number, because the mean of its divisors is an integer number (101520277561).

Almost surely, 2^203040555121 is an apocalyptic number.

It is an amenable number.

203040555121 is a deficient number, since it is larger than the sum of its proper divisors (1).

203040555121 is an equidigital number, since it uses as much as digits as its factorization.

203040555121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6000, while the sum is 28.

Adding to 203040555121 its reverse (121555040302), we get a palindrome (324595595423).

The spelling of 203040555121 in words is "two hundred three billion, forty million, five hundred fifty-five thousand, one hundred twenty-one".