21365002 has 4 divisors (see below), whose sum is σ = 32047506. Its totient is φ = 10682500.

The previous prime is 21364991. The next prime is 21365009. The reversal of 21365002 is 20056312.

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., 14969161 + 6395841 = 3869^2 + 2529^2 .

It is not an unprimeable number, because it can be changed into a prime (21365009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5341249 + ... + 5341252.

Almost surely, 2^21365002 is an apocalyptic number.

21365002 is a deficient number, since it is larger than the sum of its proper divisors (10682504).

21365002 is a wasteful number, since it uses less digits than its factorization.

21365002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10682503.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 21365002 is about 4622.2291159137. The cubic root of 21365002 is about 277.4816783077.

The spelling of 21365002 in words is "twenty-one million, three hundred sixty-five thousand, two".