21302242 has 8 divisors (see below), whose sum is σ = 34411356. Its totient is φ = 9831792.

The previous prime is 21302227. The next prime is 21302251. The reversal of 21302242 is 24220312.

It can be written as a sum of positive squares in 2 ways, for example, as 19811401 + 1490841 = 4451^2 + 1221^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 409633 + ... + 409684.

Almost surely, 2^21302242 is an apocalyptic number.

21302242 is a deficient number, since it is larger than the sum of its proper divisors (13109114).

21302242 is a wasteful number, since it uses less digits than its factorization.

21302242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819332.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 21302242 is about 4615.4351907485. The cubic root of 21302242 is about 277.2097096923.

Adding to 21302242 its reverse (24220312), we get a palindrome (45522554).

The spelling of 21302242 in words is "twenty-one million, three hundred two thousand, two hundred forty-two".