21100120111122 has 32 divisors (see below), whose sum is σ = 45446691669120. Its totient is φ = 6492304775040.

The previous prime is 21100120111093. The next prime is 21100120111123. The reversal of 21100120111122 is 22111102100112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21100120111123) 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, 13532347 + ... + 15010817.

It is an arithmetic number, because the mean of its divisors is an integer number (1420209114660).

Almost surely, 2^{21100120111122} is an apocalyptic number.

21100120111122 is an abundant number, since it is smaller than the sum of its proper divisors (24346571557998).

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

21100120111122 is a wasteful number, since it uses less digits than its factorization.

21100120111122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1661458.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21100120111122 its reverse (22111102100112), we get a palindrome (43211222211234).

The spelling of 21100120111122 in words is "twenty-one trillion, one hundred billion, one hundred twenty million, one hundred eleven thousand, one hundred twenty-two".