22507121 has 24 divisors (see below), whose sum is σ = 28584360. Its totient is φ = 17563392.

The previous prime is 22507117. The next prime is 22507123. The reversal of 22507121 is 12170522.

It can be written as a sum of positive squares in 4 ways, for example, as 313600 + 22193521 = 560^2 + 4711^2 .

It is not a de Polignac number, because 22507121 - 2² = 22507117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22507093 and 22507102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22507123) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56495 + ... + 56891.

It is an arithmetic number, because the mean of its divisors is an integer number (1191015).

Almost surely, 2^22507121 is an apocalyptic number.

It is an amenable number.

22507121 is a deficient number, since it is larger than the sum of its proper divisors (6077239).

22507121 is a wasteful number, since it uses less digits than its factorization.

22507121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513 (or 506 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 22507121 is about 4744.1670501786. The cubic root of 22507121 is about 282.3405882676.

Adding to 22507121 its reverse (12170522), we get a palindrome (34677643).

The spelling of 22507121 in words is "twenty-two million, five hundred seven thousand, one hundred twenty-one".