22784421 has 24 divisors (see below), whose sum is σ = 34856640. Its totient is φ = 13203520.

The previous prime is 22784417. The next prime is 22784423. The reversal of 22784421 is 12448722.

It is not a de Polignac number, because 22784421 - 2² = 22784417 is a prime.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22784423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6985 + ... + 9713.

It is an arithmetic number, because the mean of its divisors is an integer number (1452360).

Almost surely, 2^22784421 is an apocalyptic number.

It is an amenable number.

22784421 is a deficient number, since it is larger than the sum of its proper divisors (12072219).

22784421 is a wasteful number, since it uses less digits than its factorization.

22784421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2777 (or 2766 counting only the distinct ones).

The product of its digits is 7168, while the sum is 30.

The square root of 22784421 is about 4773.3029445029. The cubic root of 22784421 is about 283.4953885697.

It can be divided in two parts, 227 and 84421, that added together give a palindrome (84648).

The spelling of 22784421 in words is "twenty-two million, seven hundred eighty-four thousand, four hundred twenty-one".