223864821 has 24 divisors (see below), whose sum is σ = 346164000. Its totient is φ = 138985632.

The previous prime is 223864801. The next prime is 223864829. The reversal of 223864821 is 128468322.

223864821 is a `hidden beast` number, since 2 + 2 + 3 + 8 + 648 + 2 + 1 = 666.

It is not a de Polignac number, because 223864821 - 2⁶ = 223864757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223864829) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1006 + ... + 21183.

It is an arithmetic number, because the mean of its divisors is an integer number (14423500).

Almost surely, 2^223864821 is an apocalyptic number.

It is an amenable number.

223864821 is a deficient number, since it is larger than the sum of its proper divisors (122299179).

223864821 is a wasteful number, since it uses less digits than its factorization.

223864821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22273 (or 22270 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 223864821 is about 14962.1128521342. The cubic root of 223864821 is about 607.1956022142.

The spelling of 223864821 in words is "two hundred twenty-three million, eight hundred sixty-four thousand, eight hundred twenty-one".