21100113232 has 80 divisors (see below), whose sum is σ = 45605706048. Its totient is φ = 9375575040.

The previous prime is 21100113211. The next prime is 21100113233. The reversal of 21100113232 is 23231100112.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100113233) 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, 2635828 + ... + 2643820.

Almost surely, 2^21100113232 is an apocalyptic number.

21100113232 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21100113232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22802853024).

21100113232 is an abundant number, since it is smaller than the sum of its proper divisors (24505592816).

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

21100113232 is a wasteful number, since it uses less digits than its factorization.

21100113232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8348 (or 8342 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21100113232 its reverse (23231100112), we get a palindrome (44331213344).

The spelling of 21100113232 in words is "twenty-one billion, one hundred million, one hundred thirteen thousand, two hundred thirty-two".