201100221979 has 2 divisors, whose sum is σ = 201100221980. Its totient is φ = 201100221978.

The previous prime is 201100221961. The next prime is 201100222039. The reversal of 201100221979 is 979122001102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201100221979 - 2⁹ = 201100221467 is a prime.

It is not a weakly prime, because it can be changed into another prime (201100221929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100550110989 + 100550110990.

It is an arithmetic number, because the mean of its divisors is an integer number (100550110990).

Almost surely, 2^201100221979 is an apocalyptic number.

201100221979 is a deficient number, since it is larger than the sum of its proper divisors (1).

201100221979 is an equidigital number, since it uses as much as digits as its factorization.

201100221979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 34.

The spelling of 201100221979 in words is "two hundred one billion, one hundred million, two hundred twenty-one thousand, nine hundred seventy-nine".