21224334 has 16 divisors (see below), whose sum is σ = 42597072. Its totient is φ = 7050048.

The previous prime is 21224323. The next prime is 21224351. The reversal of 21224334 is 43342212.

It is a self number, because there is not a number n which added to its sum of digits gives 21224334.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4279 + ... + 7794.

It is an arithmetic number, because the mean of its divisors is an integer number (2662317).

Almost surely, 2^21224334 is an apocalyptic number.

21224334 is an abundant number, since it is smaller than the sum of its proper divisors (21372738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21224334 is a wasteful number, since it uses less digits than its factorization.

21224334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12371.

The product of its digits is 1152, while the sum is 21.

The square root of 21224334 is about 4606.9875189759. The cubic root of 21224334 is about 276.8713535045.

Adding to 21224334 its reverse (43342212), we get a palindrome (64566546).

The spelling of 21224334 in words is "twenty-one million, two hundred twenty-four thousand, three hundred thirty-four".