136021 has 4 divisors (see below), whose sum is σ = 143200. Its totient is φ = 128844.

The previous prime is 136013. The next prime is 136027. The reversal of 136021 is 120631.

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.

It is a cyclic number.

It is not a de Polignac number, because 136021 - 2³ = 136013 is a prime.

It is a Duffinian number.

136021 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 135992 and 136010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136027) 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, 3561 + ... + 3598.

It is an arithmetic number, because the mean of its divisors is an integer number (35800).

2¹³⁶⁰²¹ is an apocalyptic number.

It is an amenable number.

136021 is a deficient number, since it is larger than the sum of its proper divisors (7179).

136021 is an equidigital number, since it uses as much as digits as its factorization.

136021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7178.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 136021 is about 368.8102493153. The cubic root of 136021 is about 51.4282785845.

Adding to 136021 its reverse (120631), we get a palindrome (256652).

The spelling of 136021 in words is "one hundred thirty-six thousand, twenty-one".