21412212 has 48 divisors (see below), whose sum is σ = 51492672. Its totient is φ = 6922240.

The previous prime is 21412189. The next prime is 21412217. The reversal of 21412212 is 21221412.

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 = 21412191 and 21412200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21412217) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 83188 + ... + 83444.

It is an arithmetic number, because the mean of its divisors is an integer number (1072764).

Almost surely, 2^21412212 is an apocalyptic number.

It is an amenable number.

21412212 is an abundant number, since it is smaller than the sum of its proper divisors (30080460).

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

21412212 is a wasteful number, since it uses less digits than its factorization.

21412212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448 (or 446 counting only the distinct ones).

The product of its digits is 64, while the sum is 15.

The square root of 21412212 is about 4627.3331412381. Note that the first 3 decimals coincide. The cubic root of 21412212 is about 277.6859106461.

Adding to 21412212 its reverse (21221412), we get a palindrome (42633624).

The spelling of 21412212 in words is "twenty-one million, four hundred twelve thousand, two hundred twelve".