21222411 has 16 divisors (see below), whose sum is σ = 34041600. Its totient is φ = 11488608.

The previous prime is 21222401. The next prime is 21222433. The reversal of 21222411 is 11422212.

It is not a de Polignac number, because 21222411 - 2⁶ = 21222347 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21222401) 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, 26196 + ... + 26993.

It is an arithmetic number, because the mean of its divisors is an integer number (2127600).

Almost surely, 2^21222411 is an apocalyptic number.

21222411 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21222411 is a deficient number, since it is larger than the sum of its proper divisors (12819189).

21222411 is a wasteful number, since it uses less digits than its factorization.

21222411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53218.

The product of its digits is 64, while the sum is 15.

The square root of 21222411 is about 4606.7788095371. The cubic root of 21222411 is about 276.8629914095.

Adding to 21222411 its reverse (11422212), we get a palindrome (32644623).

The spelling of 21222411 in words is "twenty-one million, two hundred twenty-two thousand, four hundred eleven".