80203400021 has 2 divisors, whose sum is σ = 80203400022. Its totient is φ = 80203400020.

The previous prime is 80203399987. The next prime is 80203400051. The reversal of 80203400021 is 12000430208.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80188080625 + 15319396 = 283175^2 + 3914^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80203400021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 80203399966 and 80203400002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80203400051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40101700010 + 40101700011.

It is an arithmetic number, because the mean of its divisors is an integer number (40101700011).

Almost surely, 2^80203400021 is an apocalyptic number.

It is an amenable number.

80203400021 is a deficient number, since it is larger than the sum of its proper divisors (1).

80203400021 is an equidigital number, since it uses as much as digits as its factorization.

80203400021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 80203400021 its reverse (12000430208), we get a palindrome (92203830229).

The spelling of 80203400021 in words is "eighty billion, two hundred three million, four hundred thousand, twenty-one".