20020221979 has 2 divisors, whose sum is σ = 20020221980. Its totient is φ = 20020221978.

The previous prime is 20020221953. The next prime is 20020222049. The reversal of 20020221979 is 97912202002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20020221979 - 2¹¹ = 20020219931 is a prime.

It is not a weakly prime, because it can be changed into another prime (20020291979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010110989 + 10010110990.

It is an arithmetic number, because the mean of its divisors is an integer number (10010110990).

Almost surely, 2^20020221979 is an apocalyptic number.

20020221979 is a deficient number, since it is larger than the sum of its proper divisors (1).

20020221979 is an equidigital number, since it uses as much as digits as its factorization.

20020221979 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 34.

The spelling of 20020221979 in words is "twenty billion, twenty million, two hundred twenty-one thousand, nine hundred seventy-nine".