221911219997 has 2 divisors, whose sum is σ = 221911219998. Its totient is φ = 221911219996.

The previous prime is 221911219963. The next prime is 221911220023. The reversal of 221911219997 is 799912119122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184774461316 + 37136758681 = 429854^2 + 192709^2 .

It is a cyclic number.

It is not a de Polignac number, because 221911219997 - 2⁸ = 221911219741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221911219297) 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, 110955609998 + 110955609999.

It is an arithmetic number, because the mean of its divisors is an integer number (110955609999).

Almost surely, 2^221911219997 is an apocalyptic number.

It is an amenable number.

221911219997 is a deficient number, since it is larger than the sum of its proper divisors (1).

221911219997 is an equidigital number, since it uses as much as digits as its factorization.

221911219997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 367416, while the sum is 53.

The spelling of 221911219997 in words is "two hundred twenty-one billion, nine hundred eleven million, two hundred nineteen thousand, nine hundred ninety-seven".