22051865 has 8 divisors (see below), whose sum is σ = 28867968. Its totient is φ = 16037680.

The previous prime is 22051859. The next prime is 22051879. The reversal of 22051865 is 56815022.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22051865 - 2¹⁶ = 21986329 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 200417 + ... + 200526.

It is an arithmetic number, because the mean of its divisors is an integer number (3608496).

Almost surely, 2^22051865 is an apocalyptic number.

It is an amenable number.

22051865 is a deficient number, since it is larger than the sum of its proper divisors (6816103).

22051865 is a wasteful number, since it uses less digits than its factorization.

22051865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400959.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 22051865 is about 4695.9413326829. The cubic root of 22051865 is about 280.4239538471.

Adding to 22051865 its reverse (56815022), we get a palindrome (78866887).

The spelling of 22051865 in words is "twenty-two million, fifty-one thousand, eight hundred sixty-five".