136735021 has 2 divisors, whose sum is σ = 136735022. Its totient is φ = 136735020.

The previous prime is 136735009. The next prime is 136735031. The reversal of 136735021 is 120537631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136188900 + 546121 = 11670^2 + 739^2 .

It is an emirp because it is prime and its reverse (120537631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 136735021 - 2²⁵ = 103180589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136735031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68367510 + 68367511.

It is an arithmetic number, because the mean of its divisors is an integer number (68367511).

Almost surely, 2^136735021 is an apocalyptic number.

It is an amenable number.

136735021 is a deficient number, since it is larger than the sum of its proper divisors (1).

136735021 is an equidigital number, since it uses as much as digits as its factorization.

136735021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 28.

The square root of 136735021 is about 11693.3750901953. The cubic root of 136735021 is about 515.1810982164.

The spelling of 136735021 in words is "one hundred thirty-six million, seven hundred thirty-five thousand, twenty-one".