21214082 has 4 divisors (see below), whose sum is σ = 31821126. Its totient is φ = 10607040.

The previous prime is 21214049. The next prime is 21214087. The reversal of 21214082 is 28041212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20151121 + 1062961 = 4489^2 + 1031^2 .

It is not an unprimeable number, because it can be changed into a prime (21214087) by changing a digit.

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, 5303519 + ... + 5303522.

Almost surely, 2^21214082 is an apocalyptic number.

21214082 is a deficient number, since it is larger than the sum of its proper divisors (10607044).

21214082 is a wasteful number, since it uses less digits than its factorization.

21214082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10607043.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 21214082 is about 4605.8747269113. The cubic root of 21214082 is about 276.8267672250.

Adding to 21214082 its reverse (28041212), we get a palindrome (49255294).

The spelling of 21214082 in words is "twenty-one million, two hundred fourteen thousand, eighty-two".