20000000221979 has 2 divisors, whose sum is σ = 20000000221980. Its totient is φ = 20000000221978.

The previous prime is 20000000221963. The next prime is 20000000221987. The reversal of 20000000221979 is 97912200000002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20000000221979 - 2⁴ = 20000000221963 is a prime.

It is not a weakly prime, because it can be changed into another prime (20000000221079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000000110989 + 10000000110990.

It is an arithmetic number, because the mean of its divisors is an integer number (10000000110990).

Almost surely, 2^{20000000221979} is an apocalyptic number.

20000000221979 is a deficient number, since it is larger than the sum of its proper divisors (1).

20000000221979 is an equidigital number, since it uses as much as digits as its factorization.

20000000221979 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 32.

The spelling of 20000000221979 in words is "twenty trillion, two hundred twenty-one thousand, nine hundred seventy-nine".