21101102022 has 128 divisors (see below), whose sum is σ = 56739594240. Its totient is φ = 5052378240.

The previous prime is 21101102017. The next prime is 21101102039. The reversal of 21101102022 is 22020110112.

It is a junction number, because it is equal to n+sod(n) for n = 21101101989 and 21101102007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5517603 + ... + 5521425.

It is an arithmetic number, because the mean of its divisors is an integer number (443278080).

Almost surely, 2^21101102022 is an apocalyptic number.

21101102022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21101102022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28369797120).

21101102022 is an abundant number, since it is smaller than the sum of its proper divisors (35638492218).

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

21101102022 is a wasteful number, since it uses less digits than its factorization.

21101102022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4778.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21101102022 its reverse (22020110112), we get a palindrome (43121212134).

The spelling of 21101102022 in words is "twenty-one billion, one hundred one million, one hundred two thousand, twenty-two".