1000203231421 has 2 divisors, whose sum is σ = 1000203231422. Its totient is φ = 1000203231420.

The previous prime is 1000203231367. The next prime is 1000203231427. The reversal of 1000203231421 is 1241323020001.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 981167510521 + 19035720900 = 990539^2 + 137970^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000203231421 - 2¹⁵ = 1000203198653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000203231427) 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, 500101615710 + 500101615711.

It is an arithmetic number, because the mean of its divisors is an integer number (500101615711).

Almost surely, 2^{1000203231421} is an apocalyptic number.

It is an amenable number.

1000203231421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000203231421 is an equidigital number, since it uses as much as digits as its factorization.

1000203231421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 1000203231421 its reverse (1241323020001), we get a palindrome (2241526251422).

The spelling of 1000203231421 in words is "one trillion, two hundred three million, two hundred thirty-one thousand, four hundred twenty-one".