22143621 has 16 divisors (see below), whose sum is σ = 30101760. Its totient is φ = 14476800.

The previous prime is 22143587. The next prime is 22143631. The reversal of 22143621 is 12634122.

It is not a de Polignac number, because 22143621 - 2⁶ = 22143557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22143631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55021 + ... + 55421.

It is an arithmetic number, because the mean of its divisors is an integer number (1881360).

Almost surely, 2^22143621 is an apocalyptic number.

It is an amenable number.

22143621 is a deficient number, since it is larger than the sum of its proper divisors (7958139).

22143621 is a wasteful number, since it uses less digits than its factorization.

22143621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716.

The product of its digits is 576, while the sum is 21.

The square root of 22143621 is about 4705.7009042225. The cubic root of 22143621 is about 280.8123559915.

Adding to 22143621 its reverse (12634122), we get a palindrome (34777743).

The spelling of 22143621 in words is "twenty-two million, one hundred forty-three thousand, six hundred twenty-one".