2120999968 has 48 divisors (see below), whose sum is σ = 4496355360. Its totient is φ = 981185536.

The previous prime is 2120999957. The next prime is 2120999977. The reversal of 2120999968 is 8699990212.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

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, 946 + ... + 65137.

It is an arithmetic number, because the mean of its divisors is an integer number (93674070).

Almost surely, 2^2120999968 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 2120999968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2248177680).

2120999968 is an abundant number, since it is smaller than the sum of its proper divisors (2375355392).

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

2120999968 is a wasteful number, since it uses less digits than its factorization.

2120999968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66169 (or 66161 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 55.

The square root of 2120999968 is about 46054.3154112620. The cubic root of 2120999968 is about 1284.8336056102.

The spelling of 2120999968 in words is "two billion, one hundred twenty million, nine hundred ninety-nine thousand, nine hundred sixty-eight".