221136223 has 32 divisors (see below), whose sum is σ = 287400960. Its totient is φ = 165096960.

The previous prime is 221136211. The next prime is 221136233. The reversal of 221136223 is 322631122.

It is not a de Polignac number, because 221136223 - 2²¹ = 219039071 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221136194 and 221136203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221136233) 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, 372615 + ... + 373207.

It is an arithmetic number, because the mean of its divisors is an integer number (8981280).

Almost surely, 2^221136223 is an apocalyptic number.

221136223 is a deficient number, since it is larger than the sum of its proper divisors (66264737).

221136223 is a wasteful number, since it uses less digits than its factorization.

221136223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807.

The product of its digits is 864, while the sum is 22.

The square root of 221136223 is about 14870.6497168079. The cubic root of 221136223 is about 604.7185567977.

Adding to 221136223 its reverse (322631122), we get a palindrome (543767345).

The spelling of 221136223 in words is "two hundred twenty-one million, one hundred thirty-six thousand, two hundred twenty-three".