22004021 has 8 divisors (see below), whose sum is σ = 23849784. Its totient is φ = 20180160.

The previous prime is 22004009. The next prime is 22004039. The reversal of 22004021 is 12040022.

It can be written as a sum of positive squares in 4 ways, for example, as 7921 + 21996100 = 89^2 + 4690^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-22004021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22003993 and 22004011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22004041) 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 7 ways as a sum of consecutive naturals, for example, 3350 + ... + 7431.

It is an arithmetic number, because the mean of its divisors is an integer number (2981223).

Almost surely, 2^22004021 is an apocalyptic number.

It is an amenable number.

22004021 is a deficient number, since it is larger than the sum of its proper divisors (1845763).

22004021 is a wasteful number, since it uses less digits than its factorization.

22004021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10951.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 22004021 is about 4690.8443802795. The cubic root of 22004021 is about 280.2210032379.

Adding to 22004021 its reverse (12040022), we get a palindrome (34044043).

The spelling of 22004021 in words is "twenty-two million, four thousand, twenty-one".