136223821 has 2 divisors, whose sum is σ = 136223822. Its totient is φ = 136223820.

The previous prime is 136223803. The next prime is 136223831. The reversal of 136223821 is 128322631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135606025 + 617796 = 11645^2 + 786^2 .

It is a cyclic number.

It is not a de Polignac number, because 136223821 - 2²⁷ = 2006093 is a prime.

It is a Chen prime.

It is equal to p_7710670 and since 136223821 and 7710670 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 136223821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136223831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68111910 + 68111911.

It is an arithmetic number, because the mean of its divisors is an integer number (68111911).

Almost surely, 2^136223821 is an apocalyptic number.

It is an amenable number.

136223821 is a deficient number, since it is larger than the sum of its proper divisors (1).

136223821 is an equidigital number, since it uses as much as digits as its factorization.

136223821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 28.

The square root of 136223821 is about 11671.4960909045. The cubic root of 136223821 is about 514.5382746969.

The spelling of 136223821 in words is "one hundred thirty-six million, two hundred twenty-three thousand, eight hundred twenty-one".