2221304421 has 32 divisors (see below), whose sum is σ = 3567692800. Its totient is φ = 1200925440.

The previous prime is 2221304401. The next prime is 2221304443. The reversal of 2221304421 is 1244031222.

It is not a de Polignac number, because 2221304421 - 2¹⁰ = 2221303397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221304401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 339501 + ... + 345981.

It is an arithmetic number, because the mean of its divisors is an integer number (111490400).

Almost surely, 2^2221304421 is an apocalyptic number.

2221304421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2221304421 is a deficient number, since it is larger than the sum of its proper divisors (1346388379).

2221304421 is a wasteful number, since it uses less digits than its factorization.

2221304421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7369.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 2221304421 is about 47130.7163217365. The cubic root of 2221304421 is about 1304.7762021357.

Adding to 2221304421 its reverse (1244031222), we get a palindrome (3465335643).

The spelling of 2221304421 in words is "two billion, two hundred twenty-one million, three hundred four thousand, four hundred twenty-one".