21001113210103 has 16 divisors (see below), whose sum is σ = 22718650945536. Its totient is φ = 19298161507680.

The previous prime is 21001113210067. The next prime is 21001113210109. The reversal of 21001113210103 is 30101231110012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21001113210103 - 2²⁹ = 21000576339191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001113210109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129710226 + ... + 129872032.

It is an arithmetic number, because the mean of its divisors is an integer number (1419915684096).

Almost surely, 2^{21001113210103} is an apocalyptic number.

21001113210103 is a deficient number, since it is larger than the sum of its proper divisors (1717537735433).

21001113210103 is a wasteful number, since it uses less digits than its factorization.

21001113210103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206814.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21001113210103 its reverse (30101231110012), we get a palindrome (51102344320115).

The spelling of 21001113210103 in words is "twenty-one trillion, one billion, one hundred thirteen million, two hundred ten thousand, one hundred three".