39400110721 has 2 divisors, whose sum is σ = 39400110722. Its totient is φ = 39400110720.

The previous prime is 39400110689. The next prime is 39400110781. The reversal of 39400110721 is 12701100493.

39400110721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29577120400 + 9822990321 = 171980^2 + 99111^2 .

It is a cyclic number.

It is not a de Polignac number, because 39400110721 - 2⁵ = 39400110689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39400110721.

It is not a weakly prime, because it can be changed into another prime (39400110781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19700055360 + 19700055361.

It is an arithmetic number, because the mean of its divisors is an integer number (19700055361).

Almost surely, 2^39400110721 is an apocalyptic number.

It is an amenable number.

39400110721 is a deficient number, since it is larger than the sum of its proper divisors (1).

39400110721 is an equidigital number, since it uses as much as digits as its factorization.

39400110721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 28.

The spelling of 39400110721 in words is "thirty-nine billion, four hundred million, one hundred ten thousand, seven hundred twenty-one".