22003021 has 4 divisors (see below), whose sum is σ = 22197852. Its totient is φ = 21808192.

The previous prime is 22003013. The next prime is 22003027. The reversal of 22003021 is 12030022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12030022 = 2 ⋅6015011.

It can be written as a sum of positive squares in 2 ways, for example, as 2102500 + 19900521 = 1450^2 + 4461^2 .

It is a cyclic number.

It is not a de Polignac number, because 22003021 - 2³ = 22003013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22002989 and 22003007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22003027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97246 + ... + 97471.

It is an arithmetic number, because the mean of its divisors is an integer number (5549463).

Almost surely, 2^22003021 is an apocalyptic number.

It is an amenable number.

22003021 is a deficient number, since it is larger than the sum of its proper divisors (194831).

22003021 is a wasteful number, since it uses less digits than its factorization.

22003021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194830.

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 22003021 is about 4690.7377884508. The cubic root of 22003021 is about 280.2167581767.

Adding to 22003021 its reverse (12030022), we get a palindrome (34033043).

The spelling of 22003021 in words is "twenty-two million, three thousand, twenty-one".