21003002 has 8 divisors (see below), whose sum is σ = 32874336. Its totient is φ = 10044892.

The previous prime is 21003001. The next prime is 21003011. The reversal of 21003002 is 20030012.

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

It is a super-2 number, since 2×21003002² = 882252186024008, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21003001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228248 + ... + 228339.

It is an arithmetic number, because the mean of its divisors is an integer number (4109292).

Almost surely, 2^21003002 is an apocalyptic number.

21003002 is a deficient number, since it is larger than the sum of its proper divisors (11871334).

21003002 is a wasteful number, since it uses less digits than its factorization.

21003002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456612.

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 21003002 is about 4582.9032283041. The cubic root of 21003002 is about 275.9055635044.

Adding to 21003002 its reverse (20030012), we get a palindrome (41033014).

The spelling of 21003002 in words is "twenty-one million, three thousand, two".