203142434401021 has 2 divisors, whose sum is σ = 203142434401022. Its totient is φ = 203142434401020.

The previous prime is 203142434401007. The next prime is 203142434401091. The reversal of 203142434401021 is 120104434241302.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 202827585480025 + 314848920996 = 14241755^2 + 561114^2 .

It is a cyclic number.

It is not a de Polignac number, because 203142434401021 - 2¹⁵ = 203142434368253 is a prime.

It is a super-2 number, since 2×203142434401021² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203142434401091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101571217200510 + 101571217200511.

It is an arithmetic number, because the mean of its divisors is an integer number (101571217200511).

Almost surely, 2^{203142434401021} is an apocalyptic number.

It is an amenable number.

203142434401021 is a deficient number, since it is larger than the sum of its proper divisors (1).

203142434401021 is an equidigital number, since it uses as much as digits as its factorization.

203142434401021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18432, while the sum is 31.

Adding to 203142434401021 its reverse (120104434241302), we get a palindrome (323246868642323).

The spelling of 203142434401021 in words is "two hundred three trillion, one hundred forty-two billion, four hundred thirty-four million, four hundred one thousand, twenty-one".