221033220997 has 2 divisors, whose sum is σ = 221033220998. Its totient is φ = 221033220996.

The previous prime is 221033220977. The next prime is 221033221051. The reversal of 221033220997 is 799022330122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 217224973476 + 3808247521 = 466074^2 + 61711^2 .

It is a cyclic number.

It is not a de Polignac number, because 221033220997 - 2¹¹ = 221033218949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221033220917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110516610498 + 110516610499.

It is an arithmetic number, because the mean of its divisors is an integer number (110516610499).

Almost surely, 2^221033220997 is an apocalyptic number.

It is an amenable number.

221033220997 is a deficient number, since it is larger than the sum of its proper divisors (1).

221033220997 is an equidigital number, since it uses as much as digits as its factorization.

221033220997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 40.

The spelling of 221033220997 in words is "two hundred twenty-one billion, thirty-three million, two hundred twenty thousand, nine hundred ninety-seven".