22021870 has 16 divisors (see below), whose sum is σ = 42688800. Its totient is φ = 8131104.

The previous prime is 22021861. The next prime is 22021877. The reversal of 22021870 is 7812022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021877) 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 7 ways as a sum of consecutive naturals, for example, 84570 + ... + 84829.

It is an arithmetic number, because the mean of its divisors is an integer number (2668050).

Almost surely, 2^22021870 is an apocalyptic number.

22021870 is a deficient number, since it is larger than the sum of its proper divisors (20666930).

22021870 is a wasteful number, since it uses less digits than its factorization.

22021870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169419.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 22021870 is about 4692.7465305512. The cubic root of 22021870 is about 280.2967517098.

Adding to 22021870 its reverse (7812022), we get a palindrome (29833892).

The spelling of 22021870 in words is "twenty-two million, twenty-one thousand, eight hundred seventy".