321720467 has 2 divisors, whose sum is σ = 321720468. Its totient is φ = 321720466.

The previous prime is 321720433. The next prime is 321720523. The reversal of 321720467 is 764027123.

It is a weak prime.

It is an emirp because it is prime and its reverse (764027123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321720467 - 2⁸ = 321720211 is a prime.

It is not a weakly prime, because it can be changed into another prime (321120467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160860233 + 160860234.

It is an arithmetic number, because the mean of its divisors is an integer number (160860234).

Almost surely, 2^321720467 is an apocalyptic number.

321720467 is a deficient number, since it is larger than the sum of its proper divisors (1).

321720467 is an equidigital number, since it uses as much as digits as its factorization.

321720467 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 321720467 is about 17936.5678712512. The cubic root of 321720467 is about 685.2140038546.

The spelling of 321720467 in words is "three hundred twenty-one million, seven hundred twenty thousand, four hundred sixty-seven".