223420221 has 32 divisors (see below), whose sum is σ = 349516800. Its totient is φ = 140661360.

The previous prime is 223420213. The next prime is 223420231. The reversal of 223420221 is 122024322.

223420221 is a `hidden beast` number, since 2 + 23 + 420 + 221 = 666.

It is not a de Polignac number, because 223420221 - 2³ = 223420213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 223420194 and 223420203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223420201) 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, 251440 + ... + 252326.

It is an arithmetic number, because the mean of its divisors is an integer number (10922400).

Almost surely, 2^223420221 is an apocalyptic number.

It is an amenable number.

223420221 is a deficient number, since it is larger than the sum of its proper divisors (126096579).

223420221 is a wasteful number, since it uses less digits than its factorization.

223420221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1406 (or 1400 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 223420221 is about 14947.2479406746. The cubic root of 223420221 is about 606.7933682891.

Adding to 223420221 its reverse (122024322), we get a palindrome (345444543).

It can be divided in two parts, 22 and 3420221, that added together give a palindrome (3420243).

The spelling of 223420221 in words is "two hundred twenty-three million, four hundred twenty thousand, two hundred twenty-one".