221323204097 has 2 divisors, whose sum is σ = 221323204098. Its totient is φ = 221323204096.

The previous prime is 221323204093. The next prime is 221323204133. The reversal of 221323204097 is 790402323122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189957377281 + 31365826816 = 435841^2 + 177104^2 .

It is a cyclic number.

It is not a de Polignac number, because 221323204097 - 2² = 221323204093 is a prime.

It is not a weakly prime, because it can be changed into another prime (221323204093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110661602048 + 110661602049.

It is an arithmetic number, because the mean of its divisors is an integer number (110661602049).

Almost surely, 2^221323204097 is an apocalyptic number.

It is an amenable number.

221323204097 is a deficient number, since it is larger than the sum of its proper divisors (1).

221323204097 is an equidigital number, since it uses as much as digits as its factorization.

221323204097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 35.

The spelling of 221323204097 in words is "two hundred twenty-one billion, three hundred twenty-three million, two hundred four thousand, ninety-seven".