203421112021 has 2 divisors, whose sum is σ = 203421112022. Its totient is φ = 203421112020.

The previous prime is 203421112003. The next prime is 203421112031. The reversal of 203421112021 is 120211124302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168724599121 + 34696512900 = 410761^2 + 186270^2 .

It is a cyclic number.

It is not a de Polignac number, because 203421112021 - 2³⁵ = 169061373653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 203421112021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203421112031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101710556010 + 101710556011.

It is an arithmetic number, because the mean of its divisors is an integer number (101710556011).

Almost surely, 2^203421112021 is an apocalyptic number.

It is an amenable number.

203421112021 is a deficient number, since it is larger than the sum of its proper divisors (1).

203421112021 is an equidigital number, since it uses as much as digits as its factorization.

203421112021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 203421112021 its reverse (120211124302), we get a palindrome (323632236323).

The spelling of 203421112021 in words is "two hundred three billion, four hundred twenty-one million, one hundred twelve thousand, twenty-one".