22121211 has 16 divisors (see below), whose sum is σ = 33825024. Its totient is φ = 12597024.

The previous prime is 22121201. The next prime is 22121213. The reversal of 22121211 is 11212122.

It is not a de Polignac number, because 22121211 - 2⁷ = 22121083 is a prime.

It is a super-2 number, since 2×22121211² = 978695952213042, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22121213) 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, 4996 + ... + 8318.

It is an arithmetic number, because the mean of its divisors is an integer number (2114064).

Almost surely, 2^22121211 is an apocalyptic number.

22121211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

22121211 is a deficient number, since it is larger than the sum of its proper divisors (11703813).

22121211 is a wasteful number, since it uses less digits than its factorization.

22121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3650.

The product of its digits is 16, while the sum is 12.

The square root of 22121211 is about 4703.3191471555. The cubic root of 22121211 is about 280.7175938778.

Adding to 22121211 its reverse (11212122), we get a palindrome (33333333).

It can be divided in two parts, 2212121 and 1, that added together give a palindrome (2212122).

The spelling of 22121211 in words is "twenty-two million, one hundred twenty-one thousand, two hundred eleven".