21003000002 has 8 divisors (see below), whose sum is σ = 31505552316. Its totient is φ = 10501149232.

The previous prime is 21003000001. The next prime is 21003000037. The reversal of 21003000002 is 20000030012.

It can be written as a sum of positive squares in 2 ways, for example, as 20283741241 + 719258761 = 142421^2 + 26819^2 .

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

It is a super-2 number, since 2×21003000002² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21003000001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92753 + ... + 224964.

Almost surely, 2^21003000002 is an apocalyptic number.

21003000002 is a deficient number, since it is larger than the sum of its proper divisors (10502552314).

21003000002 is a wasteful number, since it uses less digits than its factorization.

21003000002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350772.

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

Adding to 21003000002 its reverse (20000030012), we get a palindrome (41003030014).

The spelling of 21003000002 in words is "twenty-one billion, three million, two", and thus it is an aban number and an uban number.