21322212 has 24 divisors (see below), whose sum is σ = 51097536. Its totient is φ = 6915168.

The previous prime is 21322207. The next prime is 21322229. The reversal of 21322212 is 21222312.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 21322191 and 21322200.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23568 + ... + 24455.

It is an arithmetic number, because the mean of its divisors is an integer number (2129064).

Almost surely, 2^21322212 is an apocalyptic number.

It is an amenable number.

21322212 is an abundant number, since it is smaller than the sum of its proper divisors (29775324).

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

21322212 is a wasteful number, since it uses less digits than its factorization.

21322212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48067 (or 48065 counting only the distinct ones).

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

The square root of 21322212 is about 4617.5980769227. The cubic root of 21322212 is about 277.2963069765.

Adding to 21322212 its reverse (21222312), we get a palindrome (42544524).

The spelling of 21322212 in words is "twenty-one million, three hundred twenty-two thousand, two hundred twelve".