22506121 has 12 divisors (see below), whose sum is σ = 25816896. Its totient is φ = 19568120.

The previous prime is 22506109. The next prime is 22506149. The reversal of 22506121 is 12160522.

It is not a de Polignac number, because 22506121 - 2¹⁷ = 22375049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22506161) 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 11 ways as a sum of consecutive naturals, for example, 1261 + ... + 6826.

It is an arithmetic number, because the mean of its divisors is an integer number (2151408).

Almost surely, 2^22506121 is an apocalyptic number.

It is an amenable number.

22506121 is a deficient number, since it is larger than the sum of its proper divisors (3310775).

22506121 is a wasteful number, since it uses less digits than its factorization.

22506121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8132 (or 8121 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 22506121 is about 4744.0616564290. The cubic root of 22506121 is about 282.3364067055.

Adding to 22506121 its reverse (12160522), we get a palindrome (34666643).

The spelling of 22506121 in words is "twenty-two million, five hundred six thousand, one hundred twenty-one".