21102101104 has 80 divisors (see below), whose sum is σ = 47292830208. Its totient is φ = 8934494976.

The previous prime is 21102101101. The next prime is 21102101117. The reversal of 21102101104 is 40110120112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102101101) 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, 5385354 + ... + 5389270.

Almost surely, 2^21102101104 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 21102101104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23646415104).

21102101104 is an abundant number, since it is smaller than the sum of its proper divisors (26190729104).

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

21102101104 is a wasteful number, since it uses less digits than its factorization.

21102101104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4502 (or 4496 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21102101104 its reverse (40110120112), we get a palindrome (61212221216).

The spelling of 21102101104 in words is "twenty-one billion, one hundred two million, one hundred one thousand, one hundred four".