220223121997 has 2 divisors, whose sum is σ = 220223121998. Its totient is φ = 220223121996.

The previous prime is 220223121991. The next prime is 220223122079. The reversal of 220223121997 is 799121322022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208712836201 + 11510285796 = 456851^2 + 107286^2 .

It is a cyclic number.

It is not a de Polignac number, because 220223121997 - 2³¹ = 218075638349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220223121991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110111560998 + 110111560999.

It is an arithmetic number, because the mean of its divisors is an integer number (110111560999).

Almost surely, 2^220223121997 is an apocalyptic number.

It is an amenable number.

220223121997 is a deficient number, since it is larger than the sum of its proper divisors (1).

220223121997 is an equidigital number, since it uses as much as digits as its factorization.

220223121997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The spelling of 220223121997 in words is "two hundred twenty billion, two hundred twenty-three million, one hundred twenty-one thousand, nine hundred ninety-seven".