21204262 has 4 divisors (see below), whose sum is σ = 31806396. Its totient is φ = 10602130.

The previous prime is 21204251. The next prime is 21204329. The reversal of 21204262 is 26240212.

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

It is a congruent 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, 5301064 + ... + 5301067.

It is an arithmetic number, because the mean of its divisors is an integer number (7951599).

Almost surely, 2^21204262 is an apocalyptic number.

21204262 is a deficient number, since it is larger than the sum of its proper divisors (10602134).

21204262 is a wasteful number, since it uses less digits than its factorization.

21204262 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10602133.

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

The square root of 21204262 is about 4604.8085736543. The cubic root of 21204262 is about 276.7840462560.

Adding to 21204262 its reverse (26240212), we get a palindrome (47444474).

The spelling of 21204262 in words is "twenty-one million, two hundred four thousand, two hundred sixty-two".