22121229 has 16 divisors (see below), whose sum is σ = 32860800. Its totient is φ = 13142976.

The previous prime is 22121213. The next prime is 22121293. The reversal of 22121229 is 92212122.

It is a happy number.

It is not a de Polignac number, because 22121229 - 2⁴ = 22121213 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121329) 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, 8649 + ... + 10910.

It is an arithmetic number, because the mean of its divisors is an integer number (2053800).

Almost surely, 2^22121229 is an apocalyptic number.

22121229 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

22121229 is a deficient number, since it is larger than the sum of its proper divisors (10739571).

22121229 is a wasteful number, since it uses less digits than its factorization.

22121229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19604.

The product of its digits is 288, while the sum is 21.

The square root of 22121229 is about 4703.3210606974. The cubic root of 22121229 is about 280.7176700176.

The spelling of 22121229 in words is "twenty-two million, one hundred twenty-one thousand, two hundred twenty-nine".