221256323 has 4 divisors (see below), whose sum is σ = 221411520. Its totient is φ = 221101128.

The previous prime is 221256319. The next prime is 221256379. The reversal of 221256323 is 323652122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221256323 - 2² = 221256319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221256292 and 221256301.

It is not an unprimeable number, because it can be changed into a prime (221256383) 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 in 3 ways as a sum of consecutive naturals, for example, 75440 + ... + 78317.

It is an arithmetic number, because the mean of its divisors is an integer number (55352880).

Almost surely, 2^221256323 is an apocalyptic number.

221256323 is a deficient number, since it is larger than the sum of its proper divisors (155197).

221256323 is a wasteful number, since it uses less digits than its factorization.

221256323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155196.

The product of its digits is 4320, while the sum is 26.

The square root of 221256323 is about 14874.6873244448. The cubic root of 221256323 is about 604.8280120371.

The spelling of 221256323 in words is "two hundred twenty-one million, two hundred fifty-six thousand, three hundred twenty-three".