22021388 has 6 divisors (see below), whose sum is σ = 38537436. Its totient is φ = 11010692.

The previous prime is 22021367. The next prime is 22021393. The reversal of 22021388 is 88312022.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2752670 + ... + 2752677.

It is an arithmetic number, because the mean of its divisors is an integer number (6422906).

Almost surely, 2^22021388 is an apocalyptic number.

It is an amenable number.

22021388 is a deficient number, since it is larger than the sum of its proper divisors (16516048).

22021388 is a wasteful number, since it uses less digits than its factorization.

22021388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5505351 (or 5505349 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 22021388 is about 4692.6951744174. The cubic root of 22021388 is about 280.2947067121.

The spelling of 22021388 in words is "twenty-two million, twenty-one thousand, three hundred eighty-eight".