39612635021 has 2 divisors, whose sum is σ = 39612635022. Its totient is φ = 39612635020.

The previous prime is 39612635011. The next prime is 39612635059. The reversal of 39612635021 is 12053621693.

39612635021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (39612635059) can be obtained adding 39612635021 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37220055625 + 2392579396 = 192925^2 + 48914^2 .

It is a cyclic number.

It is not a de Polignac number, because 39612635021 - 2²² = 39608440717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39612635011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19806317510 + 19806317511.

It is an arithmetic number, because the mean of its divisors is an integer number (19806317511).

Almost surely, 2^39612635021 is an apocalyptic number.

It is an amenable number.

39612635021 is a deficient number, since it is larger than the sum of its proper divisors (1).

39612635021 is an equidigital number, since it uses as much as digits as its factorization.

39612635021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 38.

The spelling of 39612635021 in words is "thirty-nine billion, six hundred twelve million, six hundred thirty-five thousand, twenty-one".