136360021 has 4 divisors (see below), whose sum is σ = 155840032. Its totient is φ = 116880012.

The previous prime is 136360013. The next prime is 136360039. The reversal of 136360021 is 120063631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120063631 = 37 ⋅3244963.

It is a cyclic number.

It is not a de Polignac number, because 136360021 - 2³ = 136360013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 136359974 and 136360001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136360061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9739995 + ... + 9740008.

It is an arithmetic number, because the mean of its divisors is an integer number (38960008).

Almost surely, 2^136360021 is an apocalyptic number.

It is an amenable number.

136360021 is a deficient number, since it is larger than the sum of its proper divisors (19480011).

136360021 is an equidigital number, since it uses as much as digits as its factorization.

136360021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19480010.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 136360021 is about 11677.3293607742. The cubic root of 136360021 is about 514.7097003441.

The spelling of 136360021 in words is "one hundred thirty-six million, three hundred sixty thousand, twenty-one".