321666133 has 2 divisors, whose sum is σ = 321666134. Its totient is φ = 321666132.

The previous prime is 321666097. The next prime is 321666151. The reversal of 321666133 is 331666123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 314601169 + 7064964 = 17737^2 + 2658^2 .

It is a cyclic number.

It is not a de Polignac number, because 321666133 - 2⁹ = 321665621 is a prime.

It is a super-2 number, since 2×321666133² = 206938202238347378, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 321666095 and 321666104.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321666193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160833066 + 160833067.

It is an arithmetic number, because the mean of its divisors is an integer number (160833067).

Almost surely, 2^321666133 is an apocalyptic number.

It is an amenable number.

321666133 is a deficient number, since it is larger than the sum of its proper divisors (1).

321666133 is an equidigital number, since it uses as much as digits as its factorization.

321666133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 31.

The square root of 321666133 is about 17935.0531920036. The cubic root of 321666133 is about 685.1754273909.

The spelling of 321666133 in words is "three hundred twenty-one million, six hundred sixty-six thousand, one hundred thirty-three".