22161715 has 4 divisors (see below), whose sum is σ = 26594064. Its totient is φ = 17729368.

The previous prime is 22161709. The next prime is 22161721. The reversal of 22161715 is 51716122.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (22161709) and next prime (22161721).

It is a cyclic number.

It is not a de Polignac number, because 22161715 - 2³ = 22161707 is a prime.

It is a super-2 number, since 2×22161715² = 982283223482450, 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 22161715.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2216167 + ... + 2216176.

It is an arithmetic number, because the mean of its divisors is an integer number (6648516).

Almost surely, 2^22161715 is an apocalyptic number.

22161715 is a deficient number, since it is larger than the sum of its proper divisors (4432349).

22161715 is an equidigital number, since it uses as much as digits as its factorization.

22161715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4432348.

The product of its digits is 840, while the sum is 25.

The square root of 22161715 is about 4707.6230732717. The cubic root of 22161715 is about 280.8888209844. Note that the first 4 decimals are identical.

Adding to 22161715 its reverse (51716122), we get a palindrome (73877837).

The spelling of 22161715 in words is "twenty-two million, one hundred sixty-one thousand, seven hundred fifteen".