19402209217 has 2 divisors, whose sum is σ = 19402209218. Its totient is φ = 19402209216.

The previous prime is 19402209187. The next prime is 19402209241. The reversal of 19402209217 is 71290220491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13642006401 + 5760202816 = 116799^2 + 75896^2 .

It is a cyclic number.

It is not a de Polignac number, because 19402209217 - 2¹¹ = 19402207169 is a prime.

It is not a weakly prime, because it can be changed into another prime (19402209017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9701104608 + 9701104609.

It is an arithmetic number, because the mean of its divisors is an integer number (9701104609).

Almost surely, 2^19402209217 is an apocalyptic number.

It is an amenable number.

19402209217 is a deficient number, since it is larger than the sum of its proper divisors (1).

19402209217 is an equidigital number, since it uses as much as digits as its factorization.

19402209217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 37.

The spelling of 19402209217 in words is "nineteen billion, four hundred two million, two hundred nine thousand, two hundred seventeen".