136606021 has 2 divisors, whose sum is σ = 136606022. Its totient is φ = 136606020.

The previous prime is 136606007. The next prime is 136606061. The reversal of 136606021 is 120606631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119049921 + 17556100 = 10911^2 + 4190^2 .

It is a cyclic number.

It is not a de Polignac number, because 136606021 - 2¹³ = 136597829 is a prime.

It is a super-2 number, since 2×136606021² = 37322409946904882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136606061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68303010 + 68303011.

It is an arithmetic number, because the mean of its divisors is an integer number (68303011).

Almost surely, 2^136606021 is an apocalyptic number.

It is an amenable number.

136606021 is a deficient number, since it is larger than the sum of its proper divisors (1).

136606021 is an equidigital number, since it uses as much as digits as its factorization.

136606021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 136606021 is about 11687.8578447892. The cubic root of 136606021 is about 515.0190347066.

The spelling of 136606021 in words is "one hundred thirty-six million, six hundred six thousand, twenty-one".