2121066979 has 2 divisors, whose sum is σ = 2121066980. Its totient is φ = 2121066978.

The previous prime is 2121066973. The next prime is 2121067037. The reversal of 2121066979 is 9796601212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2121066979 - 2¹⁷ = 2120935907 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121066973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060533489 + 1060533490.

It is an arithmetic number, because the mean of its divisors is an integer number (1060533490).

Almost surely, 2^2121066979 is an apocalyptic number.

2121066979 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121066979 is an equidigital number, since it uses as much as digits as its factorization.

2121066979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 2121066979 is about 46055.0429269152. The cubic root of 2121066979 is about 1284.8471365043.

The spelling of 2121066979 in words is "two billion, one hundred twenty-one million, sixty-six thousand, nine hundred seventy-nine".