221010109979 has 2 divisors, whose sum is σ = 221010109980. Its totient is φ = 221010109978.

The previous prime is 221010109961. The next prime is 221010109981. The reversal of 221010109979 is 979901010122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221010109979 is a prime.

Together with 221010109981, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221010100979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110505054989 + 110505054990.

It is an arithmetic number, because the mean of its divisors is an integer number (110505054990).

Almost surely, 2^221010109979 is an apocalyptic number.

221010109979 is a deficient number, since it is larger than the sum of its proper divisors (1).

221010109979 is an equidigital number, since it uses as much as digits as its factorization.

221010109979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20412, while the sum is 41.

The spelling of 221010109979 in words is "two hundred twenty-one billion, ten million, one hundred nine thousand, nine hundred seventy-nine".