21032111100 has 432 divisors, whose sum is σ = 82336507904. Its totient is φ = 4033497600.

The previous prime is 21032111077. The next prime is 21032111131. The reversal of 21032111100 is 111123012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 3300117 + ... + 3306483.

Almost surely, 2^21032111100 is an apocalyptic number.

21032111100 is a gapful number since it is divisible by the number (20) 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 21032111100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41168253952).

21032111100 is an abundant number, since it is smaller than the sum of its proper divisors (61304396804).

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

21032111100 is a wasteful number, since it uses less digits than its factorization.

21032111100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6426 (or 6408 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 21032111100 its reverse (111123012), we get a palindrome (21143234112).

The spelling of 21032111100 in words is "twenty-one billion, thirty-two million, one hundred eleven thousand, one hundred".