2121931056 has 320 divisors, whose sum is σ = 6915557376. Its totient is φ = 547430400.

The previous prime is 2121931051. The next prime is 2121931067. The reversal of 2121931056 is 6501391212.

2121931056 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (2121931051) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11723286 + ... + 11723466.

Almost surely, 2^2121931056 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 2121931056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3457778688).

2121931056 is an abundant number, since it is smaller than the sum of its proper divisors (4793626320).

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

2121931056 is a wasteful number, since it uses less digits than its factorization.

2121931056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300 (or 294 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 2121931056 is about 46064.4228879512. The cubic root of 2121931056 is about 1285.0215858335.

The spelling of 2121931056 in words is "two billion, one hundred twenty-one million, nine hundred thirty-one thousand, fifty-six".