221423314421 has 4 divisors (see below), whose sum is σ = 231050415072. Its totient is φ = 211796213772.

The previous prime is 221423314417. The next prime is 221423314423. The reversal of 221423314421 is 124413324122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221423314421 - 2² = 221423314417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221423314423) 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, 4813550291 + ... + 4813550336.

It is an arithmetic number, because the mean of its divisors is an integer number (57762603768).

Almost surely, 2^221423314421 is an apocalyptic number.

It is an amenable number.

221423314421 is a deficient number, since it is larger than the sum of its proper divisors (9627100651).

221423314421 is an equidigital number, since it uses as much as digits as its factorization.

221423314421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9627100650.

The product of its digits is 9216, while the sum is 29.

Adding to 221423314421 its reverse (124413324122), we get a palindrome (345836638543).

The spelling of 221423314421 in words is "two hundred twenty-one billion, four hundred twenty-three million, three hundred fourteen thousand, four hundred twenty-one".