21002013221003 has 4 divisors (see below), whose sum is σ = 21025168694040. Its totient is φ = 20978857747968.

The previous prime is 21002013220999. The next prime is 21002013221107. The reversal of 21002013221003 is 30012231020012.

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

It is a cyclic number.

It is not a de Polignac number, because 21002013221003 - 2² = 21002013220999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002013221503) 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, 11577735158 + ... + 11577736971.

It is an arithmetic number, because the mean of its divisors is an integer number (5256292173510).

Almost surely, 2^{21002013221003} is an apocalyptic number.

21002013221003 is a deficient number, since it is larger than the sum of its proper divisors (23155473037).

21002013221003 is an equidigital number, since it uses as much as digits as its factorization.

21002013221003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23155473036.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21002013221003 its reverse (30012231020012), we get a palindrome (51014244241015).

The spelling of 21002013221003 in words is "twenty-one trillion, two billion, thirteen million, two hundred twenty-one thousand, three".