21010100100111 has 24 divisors (see below), whose sum is σ = 32209420009104. Its totient is φ = 13151494782720.

The previous prime is 21010100100029. The next prime is 21010100100133. The reversal of 21010100100111 is 11100100101012.

It is not a de Polignac number, because 21010100100111 - 2²³ = 21010091711503 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 21010100100093 and 21010100100102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010100100161) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 163024561 + ... + 163153386.

It is an arithmetic number, because the mean of its divisors is an integer number (1342059167046).

Almost surely, 2^{21010100100111} is an apocalyptic number.

21010100100111 is a deficient number, since it is larger than the sum of its proper divisors (11199319908993).

21010100100111 is a wasteful number, since it uses less digits than its factorization.

21010100100111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326178391 (or 326178388 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 21010100100111 its reverse (11100100101012), we get a palindrome (32110200201123).

Subtracting from 21010100100111 its reverse (11100100101012), we obtain a palindrome (9909999999099).

The spelling of 21010100100111 in words is "twenty-one trillion, ten billion, one hundred million, one hundred thousand, one hundred eleven".