21000001101003 has 12 divisors (see below), whose sum is σ = 30341829323208. Its totient is φ = 13996080241920.

The previous prime is 21000001100999. The next prime is 21000001101041. The reversal of 21000001101003 is 30010110000012.

It is not a de Polignac number, because 21000001101003 - 2² = 21000001100999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (21000001101043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 326673750 + ... + 326738027.

It is an arithmetic number, because the mean of its divisors is an integer number (2528485776934).

Almost surely, 2^{21000001101003} is an apocalyptic number.

21000001101003 is a deficient number, since it is larger than the sum of its proper divisors (9341828222205).

21000001101003 is a wasteful number, since it uses less digits than its factorization.

21000001101003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653415354 (or 653415351 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

Adding to 21000001101003 its reverse (30010110000012), we get a palindrome (51010111101015).

The spelling of 21000001101003 in words is "twenty-one trillion, one million, one hundred one thousand, three".