39794925221 has 2 divisors, whose sum is σ = 39794925222. Its totient is φ = 39794925220.

The previous prime is 39794925179. The next prime is 39794925251. The reversal of 39794925221 is 12252949793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30192885121 + 9602040100 = 173761^2 + 97990^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39794925221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39794925251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19897462610 + 19897462611.

It is an arithmetic number, because the mean of its divisors is an integer number (19897462611).

Almost surely, 2^39794925221 is an apocalyptic number.

It is an amenable number.

39794925221 is a deficient number, since it is larger than the sum of its proper divisors (1).

39794925221 is an equidigital number, since it uses as much as digits as its factorization.

39794925221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2449440, while the sum is 53.

The spelling of 39794925221 in words is "thirty-nine billion, seven hundred ninety-four million, nine hundred twenty-five thousand, two hundred twenty-one".