22021424 has 10 divisors (see below), whose sum is σ = 42666540. Its totient is φ = 11010704.

The previous prime is 22021423. The next prime is 22021429. The reversal of 22021424 is 42412022.

It is a happy number.

It is a super-2 number, since 2×22021424² = 969886229975552, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22021423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 688154 + ... + 688185.

It is an arithmetic number, because the mean of its divisors is an integer number (4266654).

Almost surely, 2^22021424 is an apocalyptic number.

It is an amenable number.

22021424 is a deficient number, since it is larger than the sum of its proper divisors (20645116).

22021424 is a wasteful number, since it uses less digits than its factorization.

22021424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1376347 (or 1376341 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 22021424 is about 4692.6990101646. The cubic root of 22021424 is about 280.2948594515.

Adding to 22021424 its reverse (42412022), we get a palindrome (64433446).

The spelling of 22021424 in words is "twenty-two million, twenty-one thousand, four hundred twenty-four".