21342082 has 4 divisors (see below), whose sum is σ = 32013126. Its totient is φ = 10671040.

The previous prime is 21342071. The next prime is 21342119. The reversal of 21342082 is 28024312.

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., 11350161 + 9991921 = 3369^2 + 3161^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 as a sum of consecutive naturals, namely, 5335519 + ... + 5335522.

Almost surely, 2^21342082 is an apocalyptic number.

21342082 is a deficient number, since it is larger than the sum of its proper divisors (10671044).

21342082 is a wasteful number, since it uses less digits than its factorization.

21342082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10671043.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 21342082 is about 4619.7491273878. The cubic root of 21342082 is about 277.3824169756.

Adding to 21342082 its reverse (28024312), we get a palindrome (49366394).

The spelling of 21342082 in words is "twenty-one million, three hundred forty-two thousand, eighty-two".