22312121 has 4 divisors (see below), whose sum is σ = 24028452. Its totient is φ = 20595792.

The previous prime is 22312097. The next prime is 22312123. The reversal of 22312121 is 12121322.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12924025 + 9388096 = 3595^2 + 3064^2 .

It is a cyclic number.

It is not a de Polignac number, because 22312121 - 2¹⁸ = 22049977 is a prime.

It is a super-3 number, since 3×22312121³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22312096 and 22312105.

It is not an unprimeable number, because it can be changed into a prime (22312123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 858146 + ... + 858171.

It is an arithmetic number, because the mean of its divisors is an integer number (6007113).

Almost surely, 2^22312121 is an apocalyptic number.

It is an amenable number.

22312121 is a deficient number, since it is larger than the sum of its proper divisors (1716331).

22312121 is a wasteful number, since it uses less digits than its factorization.

22312121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1716330.

The product of its digits is 48, while the sum is 14.

The square root of 22312121 is about 4723.5707891382. The cubic root of 22312121 is about 281.5228295084.

Adding to 22312121 its reverse (12121322), we get a palindrome (34433443).

The spelling of 22312121 in words is "twenty-two million, three hundred twelve thousand, one hundred twenty-one".