22182921 has 6 divisors (see below), whose sum is σ = 32042010. Its totient is φ = 14788608.

The previous prime is 22182907. The next prime is 22182929. The reversal of 22182921 is 12928122.

It can be written as a sum of positive squares in only one way, i.e., 21261321 + 921600 = 4611^2 + 960^2 .

It is a de Polignac number, because none of the positive numbers 2^k-22182921 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22182929) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 1232376 + ... + 1232393.

It is an arithmetic number, because the mean of its divisors is an integer number (5340335).

Almost surely, 2^22182921 is an apocalyptic number.

It is an amenable number.

22182921 is a deficient number, since it is larger than the sum of its proper divisors (9859089).

22182921 is a wasteful number, since it uses less digits than its factorization.

22182921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2464775 (or 2464772 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 22182921 is about 4709.8748391014. The cubic root of 22182921 is about 280.9783842915.

The spelling of 22182921 in words is "twenty-two million, one hundred eighty-two thousand, nine hundred twenty-one".