21214312 has 32 divisors (see below), whose sum is σ = 47030400. Its totient is φ = 8777664.

The previous prime is 21214309. The next prime is 21214321. The reversal of 21214312 is 21341212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4908 + ... + 8155.

It is an arithmetic number, because the mean of its divisors is an integer number (1469700).

Almost surely, 2^21214312 is an apocalyptic number.

It is an amenable number.

21214312 is an abundant number, since it is smaller than the sum of its proper divisors (25816088).

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

21214312 is a wasteful number, since it uses less digits than its factorization.

21214312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13105 (or 13101 counting only the distinct ones).

The product of its digits is 96, while the sum is 16.

The square root of 21214312 is about 4605.8996949565. The cubic root of 21214312 is about 276.8277676600.

Adding to 21214312 its reverse (21341212), we get a palindrome (42555524).

The spelling of 21214312 in words is "twenty-one million, two hundred fourteen thousand, three hundred twelve".