22303021 has 4 divisors (see below), whose sum is σ = 24018652. Its totient is φ = 20587392.

The previous prime is 22303019. The next prime is 22303037. The reversal of 22303021 is 12030322.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2402500 + 19900521 = 1550^2 + 4461^2 .

It is a cyclic number.

It is not a de Polignac number, because 22303021 - 2¹ = 22303019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 1715617 = 22303021 / (2 + 2 + 3 + 0 + 3 + 0 + 2 + 1).

It is a Duffinian number.

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 22302992 and 22303010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22303091) 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 3 ways as a sum of consecutive naturals, for example, 857796 + ... + 857821.

It is an arithmetic number, because the mean of its divisors is an integer number (6004663).

Almost surely, 2^22303021 is an apocalyptic number.

It is an amenable number.

22303021 is a deficient number, since it is larger than the sum of its proper divisors (1715631).

22303021 is a wasteful number, since it uses less digits than its factorization.

22303021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1715630.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 22303021 is about 4722.6074365757. The cubic root of 22303021 is about 281.4845512693.

Adding to 22303021 its reverse (12030322), we get a palindrome (34333343).

The spelling of 22303021 in words is "twenty-two million, three hundred three thousand, twenty-one".