21201113112 has 16 divisors (see below), whose sum is σ = 53002782840. Its totient is φ = 7067037696.

The previous prime is 21201113107. The next prime is 21201113113. The reversal of 21201113112 is 21131110212.

It is a junction number, because it is equal to n+sod(n) for n = 21201113091 and 21201113100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201113113) 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, 441689833 + ... + 441689880.

Almost surely, 2^21201113112 is an apocalyptic number.

It is an amenable number.

21201113112 is an abundant number, since it is smaller than the sum of its proper divisors (31801669728).

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

21201113112 is a wasteful number, since it uses less digits than its factorization.

21201113112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883379722 (or 883379718 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21201113112 its reverse (21131110212), we get a palindrome (42332223324).

The spelling of 21201113112 in words is "twenty-one billion, two hundred one million, one hundred thirteen thousand, one hundred twelve".