22147971 has 4 divisors (see below), whose sum is σ = 29530632. Its totient is φ = 14765312.

The previous prime is 22147963. The next prime is 22147997. The reversal of 22147971 is 17974122.

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 22147971 - 2³ = 22147963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22147771) by changing a digit.

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, 3691326 + ... + 3691331.

It is an arithmetic number, because the mean of its divisors is an integer number (7382658).

Almost surely, 2^22147971 is an apocalyptic number.

22147971 is a deficient number, since it is larger than the sum of its proper divisors (7382661).

22147971 is an equidigital number, since it uses as much as digits as its factorization.

22147971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7382660.

The product of its digits is 7056, while the sum is 33.

The square root of 22147971 is about 4706.1630868469. The cubic root of 22147971 is about 280.8307428334.

Subtracting from 22147971 its reverse (17974122), we obtain a square (4173849 = 2043²).

The spelling of 22147971 in words is "twenty-two million, one hundred forty-seven thousand, nine hundred seventy-one".