2021131979 has 2 divisors, whose sum is σ = 2021131980. Its totient is φ = 2021131978.

The previous prime is 2021131963. The next prime is 2021131999. The reversal of 2021131979 is 9791311202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2021131979 - 2⁴ = 2021131963 is a prime.

It is not a weakly prime, because it can be changed into another prime (2021131939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010565989 + 1010565990.

It is an arithmetic number, because the mean of its divisors is an integer number (1010565990).

Almost surely, 2^2021131979 is an apocalyptic number.

2021131979 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021131979 is an equidigital number, since it uses as much as digits as its factorization.

2021131979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 35.

The square root of 2021131979 is about 44957.0014458260. The cubic root of 2021131979 is about 1264.3429498822.

The spelling of 2021131979 in words is "two billion, twenty-one million, one hundred thirty-one thousand, nine hundred seventy-nine".