22012865 has 8 divisors (see below), whose sum is σ = 30189120. Its totient is φ = 15094512.

The previous prime is 22012853. The next prime is 22012867. The reversal of 22012865 is 56821022.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22012865 - 2¹⁸ = 21750721 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22012867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 314435 + ... + 314504.

It is an arithmetic number, because the mean of its divisors is an integer number (3773640).

Almost surely, 2^22012865 is an apocalyptic number.

It is an amenable number.

22012865 is a deficient number, since it is larger than the sum of its proper divisors (8176255).

22012865 is an equidigital number, since it uses as much as digits as its factorization.

22012865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628951.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 22012865 is about 4691.7869729987. The cubic root of 22012865 is about 280.2585409619.

Adding to 22012865 its reverse (56821022), we get a palindrome (78833887).

The spelling of 22012865 in words is "twenty-two million, twelve thousand, eight hundred sixty-five".