202001221979 has 2 divisors, whose sum is σ = 202001221980. Its totient is φ = 202001221978.

The previous prime is 202001221969. The next prime is 202001222009. The reversal of 202001221979 is 979122100202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 202001221979 - 2¹⁶ = 202001156443 is a prime.

It is not a weakly prime, because it can be changed into another prime (202001221969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101000610989 + 101000610990.

It is an arithmetic number, because the mean of its divisors is an integer number (101000610990).

Almost surely, 2^202001221979 is an apocalyptic number.

202001221979 is a deficient number, since it is larger than the sum of its proper divisors (1).

202001221979 is an equidigital number, since it uses as much as digits as its factorization.

202001221979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 35.

The spelling of 202001221979 in words is "two hundred two billion, one million, two hundred twenty-one thousand, nine hundred seventy-nine".