21001103013 has 64 divisors (see below), whose sum is σ = 31923486720. Its totient is φ = 12170496000.

The previous prime is 21001102987. The next prime is 21001103027. The reversal of 21001103013 is 31030110012.

It is not a de Polignac number, because 21001103013 - 2²⁴ = 20984325797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21001103013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001103113) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12374581 + ... + 12376277.

It is an arithmetic number, because the mean of its divisors is an integer number (498804480).

Almost surely, 2^21001103013 is an apocalyptic number.

It is an amenable number.

21001103013 is a deficient number, since it is larger than the sum of its proper divisors (10922383707).

21001103013 is a wasteful number, since it uses less digits than its factorization.

21001103013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1938.

The product of its (nonzero) digits is 18, while the sum is 12.

Adding to 21001103013 its reverse (31030110012), we get a palindrome (52031213025).

The spelling of 21001103013 in words is "twenty-one billion, one million, one hundred three thousand, thirteen".