22121110 has 16 divisors (see below), whose sum is σ = 43438032. Its totient is φ = 8044000.

The previous prime is 22121089. The next prime is 22121137. The reversal of 22121110 is 1112122.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

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, 100441 + ... + 100660.

It is an arithmetic number, because the mean of its divisors is an integer number (2714877).

Almost surely, 2^22121110 is an apocalyptic number.

22121110 is a deficient number, since it is larger than the sum of its proper divisors (21316922).

22121110 is a wasteful number, since it uses less digits than its factorization.

22121110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201119.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 22121110 is about 4703.3084100450. The cubic root of 22121110 is about 280.7171666480.

Adding to 22121110 its reverse (1112122), we get a palindrome (23233232).

The spelling of 22121110 in words is "twenty-two million, one hundred twenty-one thousand, one hundred ten".