22215715 has 4 divisors (see below), whose sum is σ = 26658864. Its totient is φ = 17772568.

The previous prime is 22215709. The next prime is 22215737. The reversal of 22215715 is 51751222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51751222 = 2 ⋅25875611.

It is a cyclic number.

It is not a de Polignac number, because 22215715 - 2³ = 22215707 is a prime.

It is a super-2 number, since 2×22215715² = 987075985922450, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22215715.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2221567 + ... + 2221576.

It is an arithmetic number, because the mean of its divisors is an integer number (6664716).

Almost surely, 2^22215715 is an apocalyptic number.

22215715 is a deficient number, since it is larger than the sum of its proper divisors (4443149).

22215715 is an equidigital number, since it uses as much as digits as its factorization.

22215715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4443148.

The product of its digits is 1400, while the sum is 25.

The square root of 22215715 is about 4713.3549622323. The cubic root of 22215715 is about 281.1167770693.

Adding to 22215715 its reverse (51751222), we get a palindrome (73966937).

The spelling of 22215715 in words is "twenty-two million, two hundred fifteen thousand, seven hundred fifteen".