21002003002003 has 8 divisors (see below), whose sum is σ = 21153644492400. Its totient is φ = 20850369339648.

The previous prime is 21002003001971. The next prime is 21002003002021. The reversal of 21002003002003 is 30020030020012.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21002003002003 - 2⁵ = 21002003001971 is a prime.

It is a super-2 number, since 2×21002003002003² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002003002033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3482583 + ... + 7357471.

It is an arithmetic number, because the mean of its divisors is an integer number (2644205561550).

Almost surely, 2^{21002003002003} is an apocalyptic number.

21002003002003 is a deficient number, since it is larger than the sum of its proper divisors (151641490397).

21002003002003 is a wasteful number, since it uses less digits than its factorization.

21002003002003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3914021.

The product of its (nonzero) digits is 72, while the sum is 13.

Adding to 21002003002003 its reverse (30020030020012), we get a palindrome (51022033022015).

Subtracting 21002003002003 from its reverse (30020030020012), we obtain a square (9018027018009 = 3003003²).

The spelling of 21002003002003 in words is "twenty-one trillion, two billion, three million, two thousand, three".