21232212 has 24 divisors (see below), whose sum is σ = 50383200. Its totient is φ = 6957216.

The previous prime is 21232207. The next prime is 21232223. The reversal of 21232212 is 21223212.

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 = 21232191 and 21232200.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14287 + ... + 15702.

It is an arithmetic number, because the mean of its divisors is an integer number (2099300).

Almost surely, 2^21232212 is an apocalyptic number.

It is an amenable number.

21232212 is an abundant number, since it is smaller than the sum of its proper divisors (29150988).

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

21232212 is a wasteful number, since it uses less digits than its factorization.

21232212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30055 (or 30053 counting only the distinct ones).

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

The square root of 21232212 is about 4607.8424452231. The cubic root of 21232212 is about 276.9056054267.

Adding to 21232212 its reverse (21223212), we get a palindrome (42455424).

The spelling of 21232212 in words is "twenty-one million, two hundred thirty-two thousand, two hundred twelve".