19796590840921 has 2 divisors, whose sum is σ = 19796590840922. Its totient is φ = 19796590840920.

The previous prime is 19796590840913. The next prime is 19796590840933. The reversal of 19796590840921 is 12904809569791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19796590840896 + 25 = 4449336^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 19796590840921 - 2³ = 19796590840913 is a prime.

It is not a weakly prime, because it can be changed into another prime (19796590840321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9898295420460 + 9898295420461.

It is an arithmetic number, because the mean of its divisors is an integer number (9898295420461).

Almost surely, 2^{19796590840921} is an apocalyptic number.

It is an amenable number.

19796590840921 is a deficient number, since it is larger than the sum of its proper divisors (1).

19796590840921 is an equidigital number, since it uses as much as digits as its factorization.

19796590840921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 88179840, while the sum is 70.

The spelling of 19796590840921 in words is "nineteen trillion, seven hundred ninety-six billion, five hundred ninety million, eight hundred forty thousand, nine hundred twenty-one".