39221019197 has 2 divisors, whose sum is σ = 39221019198. Its totient is φ = 39221019196.

The previous prime is 39221019157. The next prime is 39221019247. The reversal of 39221019197 is 79191012293.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29662828441 + 9558190756 = 172229^2 + 97766^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39221019197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39221019127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19610509598 + 19610509599.

It is an arithmetic number, because the mean of its divisors is an integer number (19610509599).

Almost surely, 2^39221019197 is an apocalyptic number.

It is an amenable number.

39221019197 is a deficient number, since it is larger than the sum of its proper divisors (1).

39221019197 is an equidigital number, since it uses as much as digits as its factorization.

39221019197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61236, while the sum is 44.

The spelling of 39221019197 in words is "thirty-nine billion, two hundred twenty-one million, nineteen thousand, one hundred ninety-seven".