221110321979 has 2 divisors, whose sum is σ = 221110321980. Its totient is φ = 221110321978.

The previous prime is 221110321967. The next prime is 221110322021. The reversal of 221110321979 is 979123011122.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221110321979 - 2⁴ = 221110321963 is a prime.

It is not a weakly prime, because it can be changed into another prime (221110321079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110555160989 + 110555160990.

It is an arithmetic number, because the mean of its divisors is an integer number (110555160990).

Almost surely, 2^221110321979 is an apocalyptic number.

221110321979 is a deficient number, since it is larger than the sum of its proper divisors (1).

221110321979 is an equidigital number, since it uses as much as digits as its factorization.

221110321979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 38.

The spelling of 221110321979 in words is "two hundred twenty-one billion, one hundred ten million, three hundred twenty-one thousand, nine hundred seventy-nine".