220421423 has 4 divisors (see below), whose sum is σ = 221299848. Its totient is φ = 219543000.

The previous prime is 220421393. The next prime is 220421437. The reversal of 220421423 is 324124022.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 220421423 - 2⁶ = 220421359 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220421395 and 220421404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220421323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 438836 + ... + 439337.

It is an arithmetic number, because the mean of its divisors is an integer number (55324962).

Almost surely, 2^220421423 is an apocalyptic number.

220421423 is a deficient number, since it is larger than the sum of its proper divisors (878425).

220421423 is an equidigital number, since it uses as much as digits as its factorization.

220421423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878424.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 220421423 is about 14846.5963439436. The cubic root of 220421423 is about 604.0662900724.

Adding to 220421423 its reverse (324124022), we get a palindrome (544545445).

The spelling of 220421423 in words is "two hundred twenty million, four hundred twenty-one thousand, four hundred twenty-three".