22512121 has 4 divisors (see below), whose sum is σ = 22936932. Its totient is φ = 22087312.

The previous prime is 22512053. The next prime is 22512143. The reversal of 22512121 is 12121522.

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 17106496 + 5405625 = 4136^2 + 2325^2 .

It is a cyclic number.

It is not a de Polignac number, because 22512121 - 2⁹ = 22511609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22512095 and 22512104.

It is not an unprimeable number, because it can be changed into a prime (22512151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212326 + ... + 212431.

It is an arithmetic number, because the mean of its divisors is an integer number (5734233).

Almost surely, 2^22512121 is an apocalyptic number.

It is an amenable number.

22512121 is a deficient number, since it is larger than the sum of its proper divisors (424811).

22512121 is an equidigital number, since it uses as much as digits as its factorization.

22512121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424810.

The product of its digits is 80, while the sum is 16.

The square root of 22512121 is about 4744.6939838097. The cubic root of 22512121 is about 282.3614942202.

Adding to 22512121 its reverse (12121522), we get a palindrome (34633643).

The spelling of 22512121 in words is "twenty-two million, five hundred twelve thousand, one hundred twenty-one".