21101220112 has 60 divisors (see below), whose sum is σ = 46900272000. Its totient is φ = 9009413568.

The previous prime is 21101220109. The next prime is 21101220163. The reversal of 21101220112 is 21102210112.

It is a super-2 number, since 2×21101220112² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21101220092 and 21101220101.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10554889 + ... + 10556887.

It is an arithmetic number, because the mean of its divisors is an integer number (781671200).

Almost surely, 2^21101220112 is an apocalyptic number.

It is an amenable number.

21101220112 is an abundant number, since it is smaller than the sum of its proper divisors (25799051888).

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

21101220112 is an equidigital number, since it uses as much as digits as its factorization.

21101220112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2628 (or 2315 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21101220112 its reverse (21102210112), we get a palindrome (42203430224).

The spelling of 21101220112 in words is "twenty-one billion, one hundred one million, two hundred twenty thousand, one hundred twelve".