221133221917 has 2 divisors, whose sum is σ = 221133221918. Its totient is φ = 221133221916.

The previous prime is 221133221899. The next prime is 221133222043. The reversal of 221133221917 is 719122331122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153502538436 + 67630683481 = 391794^2 + 260059^2 .

It is a cyclic number.

It is not a de Polignac number, because 221133221917 - 2⁷ = 221133221789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221133221317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110566610958 + 110566610959.

It is an arithmetic number, because the mean of its divisors is an integer number (110566610959).

Almost surely, 2^221133221917 is an apocalyptic number.

It is an amenable number.

221133221917 is a deficient number, since it is larger than the sum of its proper divisors (1).

221133221917 is an equidigital number, since it uses as much as digits as its factorization.

221133221917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 34.

The spelling of 221133221917 in words is "two hundred twenty-one billion, one hundred thirty-three million, two hundred twenty-one thousand, nine hundred seventeen".