221313097 has 2 divisors, whose sum is σ = 221313098. Its totient is φ = 221313096.

The previous prime is 221313091. The next prime is 221313101. The reversal of 221313097 is 790313122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217297081 + 4016016 = 14741^2 + 2004^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221313097 is a prime.

It is not a weakly prime, because it can be changed into another prime (221313091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110656548 + 110656549.

It is an arithmetic number, because the mean of its divisors is an integer number (110656549).

Almost surely, 2^221313097 is an apocalyptic number.

It is an amenable number.

221313097 is a deficient number, since it is larger than the sum of its proper divisors (1).

221313097 is an equidigital number, since it uses as much as digits as its factorization.

221313097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 221313097 is about 14876.5956118999. The cubic root of 221313097 is about 604.8797402295.

The spelling of 221313097 in words is "two hundred twenty-one million, three hundred thirteen thousand, ninety-seven".