421221204223 has 16 divisors (see below), whose sum is σ = 455169813696. Its totient is φ = 388824733440.

The previous prime is 421221204037. The next prime is 421221204233. The reversal of 421221204223 is 322402122124.

It is a cyclic number.

It is not a de Polignac number, because 421221204223 - 2¹³ = 421221196031 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 (421221204233) 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, 2757990 + ... + 2906707.

It is an arithmetic number, because the mean of its divisors is an integer number (28448113356).

Almost surely, 2^421221204223 is an apocalyptic number.

421221204223 is a deficient number, since it is larger than the sum of its proper divisors (33948609473).

421221204223 is a wasteful number, since it uses less digits than its factorization.

421221204223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5664834.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 421221204223 its reverse (322402122124), we get a palindrome (743623326347).

The spelling of 421221204223 in words is "four hundred twenty-one billion, two hundred twenty-one million, two hundred four thousand, two hundred twenty-three".