201221199979 has 2 divisors, whose sum is σ = 201221199980. Its totient is φ = 201221199978.

The previous prime is 201221199953. The next prime is 201221200051. The reversal of 201221199979 is 979991122102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201221199979 - 2¹⁵ = 201221167211 is a prime.

It is not a weakly prime, because it can be changed into another prime (201221199079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610599989 + 100610599990.

It is an arithmetic number, because the mean of its divisors is an integer number (100610599990).

Almost surely, 2^201221199979 is an apocalyptic number.

201221199979 is a deficient number, since it is larger than the sum of its proper divisors (1).

201221199979 is an equidigital number, since it uses as much as digits as its factorization.

201221199979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 367416, while the sum is 52.

The spelling of 201221199979 in words is "two hundred one billion, two hundred twenty-one million, one hundred ninety-nine thousand, nine hundred seventy-nine".