136029821 has 2 divisors, whose sum is σ = 136029822. Its totient is φ = 136029820.

The previous prime is 136029757. The next prime is 136029851. The reversal of 136029821 is 128920631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113656921 + 22372900 = 10661^2 + 4730^2 .

It is a cyclic number.

It is not a de Polignac number, because 136029821 - 2⁶ = 136029757 is a prime.

It is a super-3 number, since 3×136029821³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136029851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68014910 + 68014911.

It is an arithmetic number, because the mean of its divisors is an integer number (68014911).

Almost surely, 2^136029821 is an apocalyptic number.

It is an amenable number.

136029821 is a deficient number, since it is larger than the sum of its proper divisors (1).

136029821 is an equidigital number, since it uses as much as digits as its factorization.

136029821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 136029821 is about 11663.1822844368. The cubic root of 136029821 is about 514.2939027319.

The spelling of 136029821 in words is "one hundred thirty-six million, twenty-nine thousand, eight hundred twenty-one".