22213021 has 4 divisors (see below), whose sum is σ = 22754844. Its totient is φ = 21671200.

The previous prime is 22213007. The next prime is 22213049. The reversal of 22213021 is 12031222.

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 11902500 + 10310521 = 3450^2 + 3211^2 .

It is a cyclic number.

It is not a de Polignac number, because 22213021 - 2⁷ = 22212893 is a prime.

It is a super-3 number, since 3×22213021³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22212992 and 22213010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22213091) 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, 270850 + ... + 270931.

It is an arithmetic number, because the mean of its divisors is an integer number (5688711).

Almost surely, 2^22213021 is an apocalyptic number.

It is an amenable number.

22213021 is a deficient number, since it is larger than the sum of its proper divisors (541823).

22213021 is an equidigital number, since it uses as much as digits as its factorization.

22213021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541822.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 22213021 is about 4713.0691698722. The cubic root of 22213021 is about 281.1054133536.

Adding to 22213021 its reverse (12031222), we get a palindrome (34244243).

The spelling of 22213021 in words is "twenty-two million, two hundred thirteen thousand, twenty-one".