21133422 has 12 divisors (see below), whose sum is σ = 45789120. Its totient is φ = 7044468.

The previous prime is 21133403. The next prime is 21133423. The reversal of 21133422 is 22433112.

21133422 is a `hidden beast` number, since 211 + 33 + 422 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1174079 = 21133422 / (2 + 1 + 1 + 3 + 3 + 4 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 21133395 and 21133404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21133423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 587022 + ... + 587057.

It is an arithmetic number, because the mean of its divisors is an integer number (3815760).

Almost surely, 2^21133422 is an apocalyptic number.

21133422 is an abundant number, since it is smaller than the sum of its proper divisors (24655698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21133422 is a wasteful number, since it uses less digits than its factorization.

21133422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174087 (or 1174084 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 21133422 is about 4597.1101792322. The cubic root of 21133422 is about 276.4754721672.

Adding to 21133422 its reverse (22433112), we get a palindrome (43566534).

It can be divided in two parts, 211 and 33422, that added together give a palindrome (33633).

The spelling of 21133422 in words is "twenty-one million, one hundred thirty-three thousand, four hundred twenty-two".