21344212 has 6 divisors (see below), whose sum is σ = 37352378. Its totient is φ = 10672104.

The previous prime is 21344209. The next prime is 21344237. The reversal of 21344212 is 21244312.

It can be written as a sum of positive squares in only one way, i.e., 11383876 + 9960336 = 3374^2 + 3156^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21344212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2668023 + ... + 2668030.

Almost surely, 2^21344212 is an apocalyptic number.

It is an amenable number.

21344212 is a deficient number, since it is larger than the sum of its proper divisors (16008166).

21344212 is a wasteful number, since it uses less digits than its factorization.

21344212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5336057 (or 5336055 counting only the distinct ones).

The product of its digits is 384, while the sum is 19.

The square root of 21344212 is about 4619.9796536349. The cubic root of 21344212 is about 277.3916445179.

Adding to 21344212 its reverse (21244312), we get a palindrome (42588524).

The spelling of 21344212 in words is "twenty-one million, three hundred forty-four thousand, two hundred twelve".