136807066021 has 2 divisors, whose sum is σ = 136807066022. Its totient is φ = 136807066020.

The previous prime is 136807066013. The next prime is 136807066049. The reversal of 136807066021 is 120660708631.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114947443521 + 21859622500 = 339039^2 + 147850^2 .

It is a cyclic number.

It is not a de Polignac number, because 136807066021 - 2³ = 136807066013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136807066321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68403533010 + 68403533011.

It is an arithmetic number, because the mean of its divisors is an integer number (68403533011).

Almost surely, 2^136807066021 is an apocalyptic number.

It is an amenable number.

136807066021 is a deficient number, since it is larger than the sum of its proper divisors (1).

136807066021 is an equidigital number, since it uses as much as digits as its factorization.

136807066021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 40.

The spelling of 136807066021 in words is "one hundred thirty-six billion, eight hundred seven million, sixty-six thousand, twenty-one".