21121020330112 has 64 divisors (see below), whose sum is σ = 43921117877760. Its totient is φ = 10097987328000.

The previous prime is 21121020330037. The next prime is 21121020330133. The reversal of 21121020330112 is 21103302012112.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 21121020330112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7639633 + ... + 10030255.

It is an arithmetic number, because the mean of its divisors is an integer number (686267466840).

Almost surely, 2^{21121020330112} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21121020330112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21960558938880).

21121020330112 is an abundant number, since it is smaller than the sum of its proper divisors (22800097547648).

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

21121020330112 is a wasteful number, since it uses less digits than its factorization.

21121020330112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2393661 (or 2393649 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21121020330112 its reverse (21103302012112), we get a palindrome (42224322342224).

The spelling of 21121020330112 in words is "twenty-one trillion, one hundred twenty-one billion, twenty million, three hundred thirty thousand, one hundred twelve".