2121139968 has 36 divisors (see below), whose sum is σ = 5645327688. Its totient is φ = 707046400.

The previous prime is 2121139957. The next prime is 2121139987. The reversal of 2121139968 is 8699311212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1380183 + ... + 1381718.

It is an arithmetic number, because the mean of its divisors is an integer number (156814658).

Almost surely, 2^2121139968 is an apocalyptic number.

It is an amenable number.

2121139968 is an abundant number, since it is smaller than the sum of its proper divisors (3524187720).

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

2121139968 is an equidigital number, since it uses as much as digits as its factorization.

2121139968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2761920 (or 2761906 counting only the distinct ones).

The product of its digits is 46656, while the sum is 42.

The square root of 2121139968 is about 46055.8353306071. The cubic root of 2121139968 is about 1284.8618741549.

The spelling of 2121139968 in words is "two billion, one hundred twenty-one million, one hundred thirty-nine thousand, nine hundred sixty-eight".