21102332100 has 144 divisors (see below), whose sum is σ = 65433395328. Its totient is φ = 5237084160.

The previous prime is 21102332051. The next prime is 21102332113. The reversal of 21102332100 is 123320112.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21102332100.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 213972 + ... + 296628.

Almost surely, 2^21102332100 is an apocalyptic number.

21102332100 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 21102332100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32716697664).

21102332100 is an abundant number, since it is smaller than the sum of its proper divisors (44331063228).

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

21102332100 is a wasteful number, since it uses less digits than its factorization.

21102332100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82734 (or 82727 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21102332100 its reverse (123320112), we get a palindrome (21225652212).

The spelling of 21102332100 in words is "twenty-one billion, one hundred two million, three hundred thirty-two thousand, one hundred".