21222133 has 4 divisors (see below), whose sum is σ = 21739788. Its totient is φ = 20704480.

The previous prime is 21222043. The next prime is 21222143. The reversal of 21222133 is 33122212.

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 4231249 + 16990884 = 2057^2 + 4122^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222133 - 2⁹ = 21221621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222143) 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, 258766 + ... + 258847.

It is an arithmetic number, because the mean of its divisors is an integer number (5434947).

Almost surely, 2^21222133 is an apocalyptic number.

It is an amenable number.

21222133 is a deficient number, since it is larger than the sum of its proper divisors (517655).

21222133 is an equidigital number, since it uses as much as digits as its factorization.

21222133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517654.

The product of its digits is 144, while the sum is 16.

The square root of 21222133 is about 4606.7486365114. The cubic root of 21222133 is about 276.8617824949.

Adding to 21222133 its reverse (33122212), we get a palindrome (54344345).

The spelling of 21222133 in words is "twenty-one million, two hundred twenty-two thousand, one hundred thirty-three".