20201222199979 has 2 divisors, whose sum is σ = 20201222199980. Its totient is φ = 20201222199978.

The previous prime is 20201222199971. The next prime is 20201222200039. The reversal of 20201222199979 is 97999122210202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20201222199979 - 2³ = 20201222199971 is a prime.

It is not a weakly prime, because it can be changed into another prime (20201222199971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100611099989 + 10100611099990.

It is an arithmetic number, because the mean of its divisors is an integer number (10100611099990).

Almost surely, 2^{20201222199979} is an apocalyptic number.

20201222199979 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201222199979 is an equidigital number, since it uses as much as digits as its factorization.

20201222199979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1469664, while the sum is 55.

The spelling of 20201222199979 in words is "twenty trillion, two hundred one billion, two hundred twenty-two million, one hundred ninety-nine thousand, nine hundred seventy-nine".