223220421 has 24 divisors (see below), whose sum is σ = 351306240. Its totient is φ = 140054976.

The previous prime is 223220419. The next prime is 223220447. The reversal of 223220421 is 124022322.

223220421 is a `hidden beast` number, since 2 + 23 + 220 + 421 = 666.

It is not a de Polignac number, because 223220421 - 2¹ = 223220419 is a prime.

It is a super-3 number, since 3×223220421³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 223220394 and 223220403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223220401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6501 + ... + 22106.

It is an arithmetic number, because the mean of its divisors is an integer number (14637760).

Almost surely, 2^223220421 is an apocalyptic number.

It is an amenable number.

223220421 is a deficient number, since it is larger than the sum of its proper divisors (128085819).

223220421 is a wasteful number, since it uses less digits than its factorization.

223220421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28650 (or 28627 counting only the distinct ones).

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

The square root of 223220421 is about 14940.5629412014. The cubic root of 223220421 is about 606.6124334981.

Adding to 223220421 its reverse (124022322), we get a palindrome (347242743).

The spelling of 223220421 in words is "two hundred twenty-three million, two hundred twenty thousand, four hundred twenty-one".