136186021 has 2 divisors, whose sum is σ = 136186022. Its totient is φ = 136186020.

The previous prime is 136185989. The next prime is 136186027. The reversal of 136186021 is 120681631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110481121 + 25704900 = 10511^2 + 5070^2 .

It is a cyclic number.

It is not a de Polignac number, because 136186021 - 2⁵ = 136185989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136186027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68093010 + 68093011.

It is an arithmetic number, because the mean of its divisors is an integer number (68093011).

Almost surely, 2^136186021 is an apocalyptic number.

It is an amenable number.

136186021 is a deficient number, since it is larger than the sum of its proper divisors (1).

136186021 is an equidigital number, since it uses as much as digits as its factorization.

136186021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 136186021 is about 11669.8766488768. The cubic root of 136186021 is about 514.4906781608.

The spelling of 136186021 in words is "one hundred thirty-six million, one hundred eighty-six thousand, twenty-one".