21103311132 has 96 divisors (see below), whose sum is σ = 56679311360. Its totient is φ = 6783160320.

The previous prime is 21103311127. The next prime is 21103311161. The reversal of 21103311132 is 23111330112.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 936348 + ... + 958620.

Almost surely, 2^21103311132 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21103311132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28339655680).

21103311132 is an abundant number, since it is smaller than the sum of its proper divisors (35576000228).

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

21103311132 is a wasteful number, since it uses less digits than its factorization.

21103311132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22600 (or 22592 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21103311132 its reverse (23111330112), we get a palindrome (44214641244).

The spelling of 21103311132 in words is "twenty-one billion, one hundred three million, three hundred eleven thousand, one hundred thirty-two".