321111407 has 2 divisors, whose sum is σ = 321111408. Its totient is φ = 321111406.

The previous prime is 321111397. The next prime is 321111409. The reversal of 321111407 is 704111123.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (704111123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321111407 - 2⁸ = 321111151 is a prime.

It is a super-2 number, since 2×321111407² = 206225071411039298, which contains 22 as substring.

Together with 321111409, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321111409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160555703 + 160555704.

It is an arithmetic number, because the mean of its divisors is an integer number (160555704).

Almost surely, 2^321111407 is an apocalyptic number.

321111407 is a deficient number, since it is larger than the sum of its proper divisors (1).

321111407 is an equidigital number, since it uses as much as digits as its factorization.

321111407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 321111407 is about 17919.5816636438. The cubic root of 321111407 is about 684.7813300282.

The spelling of 321111407 in words is "three hundred twenty-one million, one hundred eleven thousand, four hundred seven".