21214212 has 24 divisors (see below), whose sum is σ = 49585536. Its totient is φ = 7059168.

The previous prime is 21214187. The next prime is 21214229. The reversal of 21214212 is 21241212.

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 = 21214191 and 21214200.

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, 8133 + ... + 10419.

It is an arithmetic number, because the mean of its divisors is an integer number (2066064).

Almost surely, 2^21214212 is an apocalyptic number.

It is an amenable number.

21214212 is an abundant number, since it is smaller than the sum of its proper divisors (28371324).

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

21214212 is a wasteful number, since it uses less digits than its factorization.

21214212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3067 (or 3065 counting only the distinct ones).

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

The square root of 21214212 is about 4605.8888393013. Note that the first 4 decimals coincide. The cubic root of 21214212 is about 276.8273326891.

Adding to 21214212 its reverse (21241212), we get a palindrome (42455424).

Subtracting 21214212 from its reverse (21241212), we obtain a cube (27000 = 30³).

The spelling of 21214212 in words is "twenty-one million, two hundred fourteen thousand, two hundred twelve".