21314212 has 6 divisors (see below), whose sum is σ = 37299878. Its totient is φ = 10657104.

The previous prime is 21314207. The next prime is 21314221. The reversal of 21314212 is 21241312.

It can be written as a sum of positive squares in only one way, i.e., 20286016 + 1028196 = 4504^2 + 1014^2 .

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 as a sum of consecutive naturals, namely, 2664273 + ... + 2664280.

Almost surely, 2^21314212 is an apocalyptic number.

It is an amenable number.

21314212 is a deficient number, since it is larger than the sum of its proper divisors (15985666).

21314212 is a wasteful number, since it uses less digits than its factorization.

21314212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5328557 (or 5328555 counting only the distinct ones).

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

The square root of 21314212 is about 4616.7317444270. The cubic root of 21314212 is about 277.2616225207.

Adding to 21314212 its reverse (21241312), we get a palindrome (42555524).

Subtracting from 21314212 its reverse (21241312), we obtain a square (72900 = 270²).

The spelling of 21314212 in words is "twenty-one million, three hundred fourteen thousand, two hundred twelve".