21100001022 has 48 divisors (see below), whose sum is σ = 46182726720. Its totient is φ = 6961929216.

The previous prime is 21100000991. The next prime is 21100001033. The reversal of 21100001022 is 22010000112.

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 = 21100000995 and 21100001013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 858379 + ... + 882617.

It is an arithmetic number, because the mean of its divisors is an integer number (962140140).

Almost surely, 2^21100001022 is an apocalyptic number.

21100001022 is an abundant number, since it is smaller than the sum of its proper divisors (25082725698).

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

21100001022 is a wasteful number, since it uses less digits than its factorization.

21100001022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24737 (or 24734 counting only the distinct ones).

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

Adding to 21100001022 its reverse (22010000112), we get a palindrome (43110001134).

The spelling of 21100001022 in words is "twenty-one billion, one hundred million, one thousand, twenty-two".