21123311332112 has 80 divisors (see below), whose sum is σ = 45456726744000. Its totient is φ = 9427750072320.

The previous prime is 21123311332037. The next prime is 21123311332127.

21123311332112 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7712264 + ... + 10085912.

It is an arithmetic number, because the mean of its divisors is an integer number (568209084300).

Almost surely, 2^{21123311332112} is an apocalyptic number.

21123311332112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21123311332112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22728363372000).

21123311332112 is an abundant number, since it is smaller than the sum of its proper divisors (24333415411888).

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

21123311332112 is a wasteful number, since it uses less digits than its factorization.

21123311332112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2374584 (or 2374578 counting only the distinct ones).

The product of its digits is 1296, while the sum is 26.

It can be divided in two parts, 2112331 and 1332112, that added together give a palindrome (3444443).

The spelling of 21123311332112 in words is "twenty-one trillion, one hundred twenty-three billion, three hundred eleven million, three hundred thirty-two thousand, one hundred twelve".