22021439 has 8 divisors (see below), whose sum is σ = 24798720. Its totient is φ = 19373400.

The previous prime is 22021429. The next prime is 22021457. The reversal of 22021439 is 93412022.

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

It is a cyclic number.

It is not a de Polignac number, because 22021439 - 2⁴ = 22021423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021429) 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, 31949 + ... + 32630.

It is an arithmetic number, because the mean of its divisors is an integer number (3099840).

Almost surely, 2^22021439 is an apocalyptic number.

22021439 is a deficient number, since it is larger than the sum of its proper divisors (2777281).

22021439 is a wasteful number, since it uses less digits than its factorization.

22021439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64621.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 22021439 is about 4692.7006083917. The cubic root of 22021439 is about 280.2949230929.

The spelling of 22021439 in words is "twenty-two million, twenty-one thousand, four hundred thirty-nine".