21010111122 has 288 divisors, whose sum is σ = 58412757312. Its totient is φ = 4989600000.

The previous prime is 21010111103. The next prime is 21010111163. The reversal of 21010111122 is 22111101012.

It is a junction number, because it is equal to n+sod(n) for n = 21010111098 and 21010111107.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 83705497 + ... + 83705747.

It is an arithmetic number, because the mean of its divisors is an integer number (202822074).

Almost surely, 2^21010111122 is an apocalyptic number.

21010111122 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 21010111122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29206378656).

21010111122 is an abundant number, since it is smaller than the sum of its proper divisors (37402646190).

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

21010111122 is a wasteful number, since it uses less digits than its factorization.

21010111122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486 (or 468 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21010111122 its reverse (22111101012), we get a palindrome (43121212134).

The spelling of 21010111122 in words is "twenty-one billion, ten million, one hundred eleven thousand, one hundred twenty-two".