21001100113100 has 36 divisors (see below), whose sum is σ = 46542012516384. Its totient is φ = 8221707276480.

The previous prime is 21001100113079. The next prime is 21001100113109. The reversal of 21001100113100 is 131100110012.

It is a happy number.

It is a super-2 number, since 2×21001100113100² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21001100113109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2234154887 + ... + 2234164286.

Almost surely, 2^{21001100113100} is an apocalyptic number.

21001100113100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21001100113100 is an abundant number, since it is smaller than the sum of its proper divisors (25540912403284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21001100113100 is a wasteful number, since it uses less digits than its factorization.

21001100113100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4468319234 (or 4468319227 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 11.

Adding to 21001100113100 its reverse (131100110012), we get a palindrome (21132200223112).

The spelling of 21001100113100 in words is "twenty-one trillion, one billion, one hundred million, one hundred thirteen thousand, one hundred".