136821223 has 32 divisors (see below), whose sum is σ = 184020480. Its totient is φ = 98496000.

The previous prime is 136821203. The next prime is 136821229. The reversal of 136821223 is 322128631.

It is not a de Polignac number, because 136821223 - 2¹³ = 136813031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 136821191 and 136821200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136821229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58843 + ... + 61123.

It is an arithmetic number, because the mean of its divisors is an integer number (5750640).

Almost surely, 2^136821223 is an apocalyptic number.

136821223 is a deficient number, since it is larger than the sum of its proper divisors (47199257).

136821223 is a wasteful number, since it uses less digits than its factorization.

136821223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2359.

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

The square root of 136821223 is about 11697.0604426924. The cubic root of 136821223 is about 515.2893375238.

Adding to 136821223 its reverse (322128631), we get a palindrome (458949854).

The spelling of 136821223 in words is "one hundred thirty-six million, eight hundred twenty-one thousand, two hundred twenty-three".