22501215 has 48 divisors (see below), whose sum is σ = 42996096. Its totient is φ = 10795200.

The previous prime is 22501211. The next prime is 22501223. The reversal of 22501215 is 51210522.

It is not a de Polignac number, because 22501215 - 2² = 22501211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22501211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 64672 + ... + 65018.

It is an arithmetic number, because the mean of its divisors is an integer number (895752).

Almost surely, 2^22501215 is an apocalyptic number.

22501215 is a deficient number, since it is larger than the sum of its proper divisors (20494881).

22501215 is a wasteful number, since it uses less digits than its factorization.

22501215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500 (or 497 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 22501215 is about 4743.5445607689. The cubic root of 22501215 is about 282.3158901674.

Adding to 22501215 its reverse (51210522), we get a palindrome (73711737).

The spelling of 22501215 in words is "twenty-two million, five hundred one thousand, two hundred fifteen".