221234213423 has 4 divisors (see below), whose sum is σ = 222558969360. Its totient is φ = 219909457488.

The previous prime is 221234213383. The next prime is 221234213483. The reversal of 221234213423 is 324312432122.

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 221234213423 - 2¹⁴ = 221234197039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221234213483) 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, 662377718 + ... + 662378051.

It is an arithmetic number, because the mean of its divisors is an integer number (55639742340).

Almost surely, 2^221234213423 is an apocalyptic number.

221234213423 is a deficient number, since it is larger than the sum of its proper divisors (1324755937).

221234213423 is a wasteful number, since it uses less digits than its factorization.

221234213423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324755936.

The product of its digits is 13824, while the sum is 29.

Adding to 221234213423 its reverse (324312432122), we get a palindrome (545546645545).

The spelling of 221234213423 in words is "two hundred twenty-one billion, two hundred thirty-four million, two hundred thirteen thousand, four hundred twenty-three".