2121133776 has 80 divisors (see below), whose sum is σ = 5775701760. Its totient is φ = 669760000.

The previous prime is 2121133757. The next prime is 2121133789. The reversal of 2121133776 is 6773311212.

It is a congruent number.

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, 59401 + ... + 88151.

It is an arithmetic number, because the mean of its divisors is an integer number (72196272).

Almost surely, 2^2121133776 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 2121133776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2887850880).

2121133776 is an abundant number, since it is smaller than the sum of its proper divisors (3654567984).

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

2121133776 is a wasteful number, since it uses less digits than its factorization.

2121133776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28844 (or 28838 counting only the distinct ones).

The product of its digits is 10584, while the sum is 33.

The square root of 2121133776 is about 46055.7681078060. The cubic root of 2121133776 is about 1284.8606239038.

Adding to 2121133776 its reverse (6773311212), we get a palindrome (8894444988).

The spelling of 2121133776 in words is "two billion, one hundred twenty-one million, one hundred thirty-three thousand, seven hundred seventy-six".