221424423 has 16 divisors (see below), whose sum is σ = 339024000. Its totient is φ = 127133280.

The previous prime is 221424377. The next prime is 221424431. The reversal of 221424423 is 324424122.

It is not a de Polignac number, because 221424423 - 2¹³ = 221416231 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221424393 and 221424402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221424433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175948 + ... + 177201.

It is an arithmetic number, because the mean of its divisors is an integer number (21189000).

Almost surely, 2^221424423 is an apocalyptic number.

221424423 is a deficient number, since it is larger than the sum of its proper divisors (117599577).

221424423 is a wasteful number, since it uses less digits than its factorization.

221424423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353182.

The product of its digits is 3072, while the sum is 24.

The square root of 221424423 is about 14880.3367905434. The cubic root of 221424423 is about 604.9811464197.

Adding to 221424423 its reverse (324424122), we get a palindrome (545848545).

It can be divided in two parts, 22142 and 4423, that added together give a triangular number (26565 = T₂₃₀).

The spelling of 221424423 in words is "two hundred twenty-one million, four hundred twenty-four thousand, four hundred twenty-three".