22121823 has 16 divisors (see below), whose sum is σ = 30356480. Its totient is φ = 14321664.

The previous prime is 22121821. The next prime is 22121843. The reversal of 22121823 is 32812122.

It is a happy number.

It is not a de Polignac number, because 22121823 - 2¹ = 22121821 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22121823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28383 + ... + 29151.

It is an arithmetic number, because the mean of its divisors is an integer number (1897280).

Almost surely, 2^22121823 is an apocalyptic number.

22121823 is a deficient number, since it is larger than the sum of its proper divisors (8234657).

22121823 is a wasteful number, since it uses less digits than its factorization.

22121823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038.

The product of its digits is 384, while the sum is 21.

The square root of 22121823 is about 4703.3842071428. The cubic root of 22121823 is about 280.7201826087.

Adding to 22121823 its reverse (32812122), we get a palindrome (54933945).

The spelling of 22121823 in words is "twenty-two million, one hundred twenty-one thousand, eight hundred twenty-three".