200419890821 has 2 divisors, whose sum is σ = 200419890822. Its totient is φ = 200419890820.

The previous prime is 200419890817. The next prime is 200419890893. The reversal of 200419890821 is 128098914002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147579673921 + 52840216900 = 384161^2 + 229870^2 .

It is a cyclic number.

It is not a de Polignac number, because 200419890821 - 2² = 200419890817 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200419890721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100209945410 + 100209945411.

It is an arithmetic number, because the mean of its divisors is an integer number (100209945411).

Almost surely, 2^200419890821 is an apocalyptic number.

It is an amenable number.

200419890821 is a deficient number, since it is larger than the sum of its proper divisors (1).

200419890821 is an equidigital number, since it uses as much as digits as its factorization.

200419890821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 44.

The spelling of 200419890821 in words is "two hundred billion, four hundred nineteen million, eight hundred ninety thousand, eight hundred twenty-one".