22031021 has 8 divisors (see below), whose sum is σ = 22688280. Its totient is φ = 21377088.

The previous prime is 22031017. The next prime is 22031027. The reversal of 22031021 is 12013022.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2758921 + 19272100 = 1661^2 + 4390^2 .

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 22031021 - 2² = 22031017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22030993 and 22031011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22031027) 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, 20075 + ... + 21143.

It is an arithmetic number, because the mean of its divisors is an integer number (2836035).

Almost surely, 2^22031021 is an apocalyptic number.

It is an amenable number.

22031021 is a deficient number, since it is larger than the sum of its proper divisors (657259).

22031021 is a wasteful number, since it uses less digits than its factorization.

22031021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1663.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 22031021 is about 4693.7214446535. The cubic root of 22031021 is about 280.3355713070.

Adding to 22031021 its reverse (12013022), we get a palindrome (34044043).

The spelling of 22031021 in words is "twenty-two million, thirty-one thousand, twenty-one".