22122121 has 4 divisors (see below), whose sum is σ = 25282432. Its totient is φ = 18961812.

The previous prime is 22122103. The next prime is 22122169. The reversal of 22122121 is 12122122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22122121 - 2⁹ = 22121609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22122421) 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 3 ways as a sum of consecutive naturals, for example, 1580145 + ... + 1580158.

It is an arithmetic number, because the mean of its divisors is an integer number (6320608).

Almost surely, 2^22122121 is an apocalyptic number.

It is an amenable number.

22122121 is a deficient number, since it is larger than the sum of its proper divisors (3160311).

22122121 is an equidigital number, since it uses as much as digits as its factorization.

22122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3160310.

The product of its digits is 32, while the sum is 13.

The square root of 22122121 is about 4703.4158863532. The cubic root of 22122121 is about 280.7214431172.

Adding to 22122121 its reverse (12122122), we get a palindrome (34244243).

Subtracting from 22122121 its reverse (12122122), we obtain a palindrome (9999999).

It can be divided in two parts, 22122 and 121, that multiplied together give a palindrome (2676762).

The spelling of 22122121 in words is "twenty-two million, one hundred twenty-two thousand, one hundred twenty-one".