22387121 has 4 divisors (see below), whose sum is σ = 22429044. Its totient is φ = 22345200.

The previous prime is 22387097. The next prime is 22387139. The reversal of 22387121 is 12178322.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10962721 + 11424400 = 3311^2 + 3380^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22387121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22387171) 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, 20150 + ... + 21231.

It is an arithmetic number, because the mean of its divisors is an integer number (5607261).

Almost surely, 2^22387121 is an apocalyptic number.

It is an amenable number.

22387121 is a deficient number, since it is larger than the sum of its proper divisors (41923).

22387121 is an equidigital number, since it uses as much as digits as its factorization.

22387121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41922.

The product of its digits is 1344, while the sum is 26.

The square root of 22387121 is about 4731.5030381476. The cubic root of 22387121 is about 281.8379138298.

The spelling of 22387121 in words is "twenty-two million, three hundred eighty-seven thousand, one hundred twenty-one".