39721125113 has 2 divisors, whose sum is σ = 39721125114. Its totient is φ = 39721125112.

The previous prime is 39721125083. The next prime is 39721125139. The reversal of 39721125113 is 31152112793.

39721125113 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34788591289 + 4932533824 = 186517^2 + 70232^2 .

It is a cyclic number.

It is not a de Polignac number, because 39721125113 - 2³² = 35426157817 is a prime.

It is not a weakly prime, because it can be changed into another prime (39721125193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19860562556 + 19860562557.

It is an arithmetic number, because the mean of its divisors is an integer number (19860562557).

Almost surely, 2^39721125113 is an apocalyptic number.

It is an amenable number.

39721125113 is a deficient number, since it is larger than the sum of its proper divisors (1).

39721125113 is an equidigital number, since it uses as much as digits as its factorization.

39721125113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 35.

The spelling of 39721125113 in words is "thirty-nine billion, seven hundred twenty-one million, one hundred twenty-five thousand, one hundred thirteen".