19605921193 has 2 divisors, whose sum is σ = 19605921194. Its totient is φ = 19605921192.

The previous prime is 19605921107. The next prime is 19605921217. The reversal of 19605921193 is 39112950691.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18189377424 + 1416543769 = 134868^2 + 37637^2 .

It is a cyclic number.

It is not a de Polignac number, because 19605921193 - 2⁹ = 19605920681 is a prime.

It is a super-2 number, since 2×19605921193² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19605921793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9802960596 + 9802960597.

It is an arithmetic number, because the mean of its divisors is an integer number (9802960597).

Almost surely, 2^19605921193 is an apocalyptic number.

It is an amenable number.

19605921193 is a deficient number, since it is larger than the sum of its proper divisors (1).

19605921193 is an equidigital number, since it uses as much as digits as its factorization.

19605921193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 131220, while the sum is 46.

The spelling of 19605921193 in words is "nineteen billion, six hundred five million, nine hundred twenty-one thousand, one hundred ninety-three".