21100010022 has 96 divisors (see below), whose sum is σ = 56515560192. Its totient is φ = 5540225472.

The previous prime is 21100009981. The next prime is 21100010027. The reversal of 21100010022 is 22001000112.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 21100009986 and 21100010013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100010027) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 343453 + ... + 400199.

It is an arithmetic number, because the mean of its divisors is an integer number (588703752).

Almost surely, 2^21100010022 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21100010022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28257780096).

21100010022 is an abundant number, since it is smaller than the sum of its proper divisors (35415550170).

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

21100010022 is a wasteful number, since it uses less digits than its factorization.

21100010022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57002 (or 56999 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 21100010022 its reverse (22001000112), we get a palindrome (43101010134).

The spelling of 21100010022 in words is "twenty-one billion, one hundred million, ten thousand, twenty-two".