221563231 has 8 divisors (see below), whose sum is σ = 232588800. Its totient is φ = 210780120.

The previous prime is 221563213. The next prime is 221563241. The reversal of 221563231 is 132365122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221563231 - 2¹⁹ = 221038943 is a prime.

It is a super-2 number, since 2×221563231² = 98180530662318722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221563196 and 221563205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221563201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58741 + ... + 62398.

It is an arithmetic number, because the mean of its divisors is an integer number (29073600).

Almost surely, 2^221563231 is an apocalyptic number.

221563231 is a deficient number, since it is larger than the sum of its proper divisors (11025569).

221563231 is a wasteful number, since it uses less digits than its factorization.

221563231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121229.

The product of its digits is 2160, while the sum is 25.

The square root of 221563231 is about 14885.0002015452. Note that the first 3 decimals coincide. The cubic root of 221563231 is about 605.1075382003.

The spelling of 221563231 in words is "two hundred twenty-one million, five hundred sixty-three thousand, two hundred thirty-one".