221308863 has 8 divisors (see below), whose sum is σ = 295176576. Its totient is φ = 147490200.

The previous prime is 221308861. The next prime is 221308891. The reversal of 221308863 is 368803122.

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

It is not a de Polignac number, because 221308863 - 2¹ = 221308861 is a prime.

It is a super-2 number, since 2×221308863² = 97955225684705538, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221308861) 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, 28 + ... + 21038.

It is an arithmetic number, because the mean of its divisors is an integer number (36897072).

Almost surely, 2^221308863 is an apocalyptic number.

221308863 is a deficient number, since it is larger than the sum of its proper divisors (73867713).

221308863 is a wasteful number, since it uses less digits than its factorization.

221308863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24525.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 221308863 is about 14876.4533071562. The cubic root of 221308863 is about 604.8758828329.

The spelling of 221308863 in words is "two hundred twenty-one million, three hundred eight thousand, eight hundred sixty-three".