203453354021 has 2 divisors, whose sum is σ = 203453354022. Its totient is φ = 203453354020.

The previous prime is 203453354011. The next prime is 203453354033. The reversal of 203453354021 is 120453354302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193802452900 + 9650901121 = 440230^2 + 98239^2 .

It is a cyclic number.

It is not a de Polignac number, because 203453354021 - 2²² = 203449159717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203453354011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101726677010 + 101726677011.

It is an arithmetic number, because the mean of its divisors is an integer number (101726677011).

Almost surely, 2^203453354021 is an apocalyptic number.

It is an amenable number.

203453354021 is a deficient number, since it is larger than the sum of its proper divisors (1).

203453354021 is an equidigital number, since it uses as much as digits as its factorization.

203453354021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 32.

The spelling of 203453354021 in words is "two hundred three billion, four hundred fifty-three million, three hundred fifty-four thousand, twenty-one".