201021220111979 has 2 divisors, whose sum is σ = 201021220111980. Its totient is φ = 201021220111978.

The previous prime is 201021220111949. The next prime is 201021220112071. The reversal of 201021220111979 is 979111022120102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201021220111979 - 2⁴⁰ = 199921708484203 is a prime.

It is not a weakly prime, because it can be changed into another prime (201021220111949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100510610055989 + 100510610055990.

It is an arithmetic number, because the mean of its divisors is an integer number (100510610055990).

Almost surely, 2^{201021220111979} is an apocalyptic number.

201021220111979 is a deficient number, since it is larger than the sum of its proper divisors (1).

201021220111979 is an equidigital number, since it uses as much as digits as its factorization.

201021220111979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 38.

The spelling of 201021220111979 in words is "two hundred one trillion, twenty-one billion, two hundred twenty million, one hundred eleven thousand, nine hundred seventy-nine".