221121100120979 has 2 divisors, whose sum is σ = 221121100120980. Its totient is φ = 221121100120978.

The previous prime is 221121100120967. The next prime is 221121100121023. The reversal of 221121100120979 is 979021001121122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221121100120979 - 2¹² = 221121100116883 is a prime.

It is not a weakly prime, because it can be changed into another prime (221121109120979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110560550060489 + 110560550060490.

It is an arithmetic number, because the mean of its divisors is an integer number (110560550060490).

Almost surely, 2^{221121100120979} is an apocalyptic number.

221121100120979 is a deficient number, since it is larger than the sum of its proper divisors (1).

221121100120979 is an equidigital number, since it uses as much as digits as its factorization.

221121100120979 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 38.

The spelling of 221121100120979 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, one hundred million, one hundred twenty thousand, nine hundred seventy-nine".