21132222 has 16 divisors (see below), whose sum is σ = 42324240. Its totient is φ = 7034112.

The previous prime is 21132211. The next prime is 21132229. The reversal of 21132222 is 22223112.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21132229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3054 + ... + 7182.

It is an arithmetic number, because the mean of its divisors is an integer number (2645265).

Almost surely, 2^21132222 is an apocalyptic number.

21132222 is an abundant number, since it is smaller than the sum of its proper divisors (21192018).

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

21132222 is a wasteful number, since it uses less digits than its factorization.

21132222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4987.

The product of its digits is 96, while the sum is 15.

The square root of 21132222 is about 4596.9796606033. The cubic root of 21132222 is about 276.4702391158.

Adding to 21132222 its reverse (22223112), we get a palindrome (43355334).

The spelling of 21132222 in words is "twenty-one million, one hundred thirty-two thousand, two hundred twenty-two".