221222100977 has 2 divisors, whose sum is σ = 221222100978. Its totient is φ = 221222100976.

The previous prime is 221222100929. The next prime is 221222101031. The reversal of 221222100977 is 779001222122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 212019727936 + 9202373041 = 460456^2 + 95929^2 .

It is a cyclic number.

It is not a de Polignac number, because 221222100977 - 2¹² = 221222096881 is a prime.

It is not a weakly prime, because it can be changed into another prime (221222130977) 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, 110611050488 + 110611050489.

It is an arithmetic number, because the mean of its divisors is an integer number (110611050489).

Almost surely, 2^221222100977 is an apocalyptic number.

It is an amenable number.

221222100977 is a deficient number, since it is larger than the sum of its proper divisors (1).

221222100977 is an equidigital number, since it uses as much as digits as its factorization.

221222100977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 35.

The spelling of 221222100977 in words is "two hundred twenty-one billion, two hundred twenty-two million, one hundred thousand, nine hundred seventy-seven".