2120121988 has 12 divisors (see below), whose sum is σ = 3726138780. Its totient is φ = 1055510912.

The previous prime is 2120121967. The next prime is 2120122001. The reversal of 2120121988 is 8891210212.

It can be written as a sum of positive squares in 2 ways, for example, as 533055744 + 1587066244 = 23088^2 + 39838^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1136473 + ... + 1138336.

It is an arithmetic number, because the mean of its divisors is an integer number (310511565).

Almost surely, 2^2120121988 is an apocalyptic number.

It is an amenable number.

2120121988 is a deficient number, since it is larger than the sum of its proper divisors (1606016792).

2120121988 is a wasteful number, since it uses less digits than its factorization.

2120121988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2275046 (or 2275044 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 34.

The square root of 2120121988 is about 46044.7824188583. The cubic root of 2120121988 is about 1284.6562971214.

The spelling of 2120121988 in words is "two billion, one hundred twenty million, one hundred twenty-one thousand, nine hundred eighty-eight".