2121980668 has 12 divisors (see below), whose sum is σ = 3716067600. Its totient is φ = 1060247072.

The previous prime is 2121980617. The next prime is 2121980671. The reversal of 2121980668 is 8660891212.

It is a happy number.

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, 179368 + ... + 190831.

It is an arithmetic number, because the mean of its divisors is an integer number (309672300).

Almost surely, 2^2121980668 is an apocalyptic number.

It is an amenable number.

2121980668 is a deficient number, since it is larger than the sum of its proper divisors (1594086932).

2121980668 is a wasteful number, since it uses less digits than its factorization.

2121980668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371636 (or 371634 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 2121980668 is about 46064.9613914958. The cubic root of 2121980668 is about 1285.0316006097.

The spelling of 2121980668 in words is "two billion, one hundred twenty-one million, nine hundred eighty thousand, six hundred sixty-eight".