2121001111120 has 40 divisors (see below), whose sum is σ = 4936375183464. Its totient is φ = 847532040192.

The previous prime is 2121001111109. The next prime is 2121001111133. The reversal of 2121001111120 is 211111001212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 81108761616 + 2039892349504 = 284796^2 + 1428248^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 2121001111120.

It is a congruent number.

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, 13490169 + ... + 13646488.

Almost surely, 2^{2121001111120} is an apocalyptic number.

2121001111120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121001111120 is an abundant number, since it is smaller than the sum of its proper divisors (2815374072344).

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

2121001111120 is a wasteful number, since it uses less digits than its factorization.

2121001111120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27137647 (or 27137641 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 2121001111120 its reverse (211111001212), we get a palindrome (2332112112332).

The spelling of 2121001111120 in words is "two trillion, one hundred twenty-one billion, one million, one hundred eleven thousand, one hundred twenty".