22161247 has 4 divisors (see below), whose sum is σ = 22174776. Its totient is φ = 22147720.

The previous prime is 22161241. The next prime is 22161281. The reversal of 22161247 is 74216122.

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

It is a cyclic number.

It is not a de Polignac number, because 22161247 - 2²³ = 13772639 is a prime.

It is a super-2 number, since 2×22161247² = 982241737190018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22161241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3904 + ... + 7717.

It is an arithmetic number, because the mean of its divisors is an integer number (5543694).

Almost surely, 2^22161247 is an apocalyptic number.

22161247 is a deficient number, since it is larger than the sum of its proper divisors (13529).

22161247 is a wasteful number, since it uses less digits than its factorization.

22161247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13528.

The product of its digits is 1344, while the sum is 25.

The square root of 22161247 is about 4707.5733663959. The cubic root of 22161247 is about 280.8868437473.

Adding to 22161247 its reverse (74216122), we get a palindrome (96377369).

The spelling of 22161247 in words is "twenty-two million, one hundred sixty-one thousand, two hundred forty-seven".