136212521 has 2 divisors, whose sum is σ = 136212522. Its totient is φ = 136212520.

The previous prime is 136212493. The next prime is 136212547. The reversal of 136212521 is 125212631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113124496 + 23088025 = 10636^2 + 4805^2 .

It is a cyclic number.

It is not a de Polignac number, because 136212521 - 2²² = 132018217 is a prime.

It is a Chen prime.

It is equal to p_7710044 and since 136212521 and 7710044 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (136212581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68106260 + 68106261.

It is an arithmetic number, because the mean of its divisors is an integer number (68106261).

Almost surely, 2^136212521 is an apocalyptic number.

It is an amenable number.

136212521 is a deficient number, since it is larger than the sum of its proper divisors (1).

136212521 is an equidigital number, since it uses as much as digits as its factorization.

136212521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 23.

The square root of 136212521 is about 11671.0119955383. The cubic root of 136212521 is about 514.5240470256.

The spelling of 136212521 in words is "one hundred thirty-six million, two hundred twelve thousand, five hundred twenty-one".