21020100112 has 20 divisors (see below), whose sum is σ = 44428848336. Its totient is φ = 9554590880.

The previous prime is 21020100071. The next prime is 21020100119. The reversal of 21020100112 is 21100102012.

It is not an unprimeable number, because it can be changed into a prime (21020100119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59716018 + ... + 59716369.

Almost surely, 2^21020100112 is an apocalyptic number.

21020100112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21020100112 is an abundant number, since it is smaller than the sum of its proper divisors (23408748224).

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

21020100112 is a wasteful number, since it uses less digits than its factorization.

21020100112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119432406 (or 119432400 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21020100112 its reverse (21100102012), we get a palindrome (42120202124).

The spelling of 21020100112 in words is "twenty-one billion, twenty million, one hundred thousand, one hundred twelve".