22508121 has 4 divisors (see below), whose sum is σ = 30010832. Its totient is φ = 15005412.

The previous prime is 22508117. The next prime is 22508137. The reversal of 22508121 is 12180522.

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 not a de Polignac number, because 22508121 - 2² = 22508117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22508021) 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, 3751351 + ... + 3751356.

It is an arithmetic number, because the mean of its divisors is an integer number (7502708).

Almost surely, 2^22508121 is an apocalyptic number.

It is an amenable number.

22508121 is a deficient number, since it is larger than the sum of its proper divisors (7502711).

22508121 is an equidigital number, since it uses as much as digits as its factorization.

22508121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7502710.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 22508121 is about 4744.2724415868. The cubic root of 22508121 is about 282.3447697058.

Adding to 22508121 its reverse (12180522), we get a palindrome (34688643).

The spelling of 22508121 in words is "twenty-two million, five hundred eight thousand, one hundred twenty-one".