22121242 has 16 divisors (see below), whose sum is σ = 38983392. Its totient is φ = 9281520.

The previous prime is 22121213. The next prime is 22121293. The reversal of 22121242 is 24212122.

It is a plaindrome in base 9.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 38388 + ... + 38959.

It is an arithmetic number, because the mean of its divisors is an integer number (2436462).

Almost surely, 2^22121242 is an apocalyptic number.

22121242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

22121242 is a deficient number, since it is larger than the sum of its proper divisors (16862150).

22121242 is a wasteful number, since it uses less digits than its factorization.

22121242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77373.

The product of its digits is 128, while the sum is 16.

The square root of 22121242 is about 4703.3224426994. The cubic root of 22121242 is about 280.7177250075.

Subtracting from 22121242 its sum of digits (16), we obtain a triangular number (22121226 = T₆₆₅₁).

Adding to 22121242 its reverse (24212122), we get a palindrome (46333364).

The spelling of 22121242 in words is "twenty-two million, one hundred twenty-one thousand, two hundred forty-two".