321020971 has 2 divisors, whose sum is σ = 321020972. Its totient is φ = 321020970.

The previous prime is 321020969. The next prime is 321020983. The reversal of 321020971 is 179020123.

It is a weak prime.

It is an emirp because it is prime and its reverse (179020123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321020971 - 2¹ = 321020969 is a prime.

Together with 321020969, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (321020071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160510485 + 160510486.

It is an arithmetic number, because the mean of its divisors is an integer number (160510486).

Almost surely, 2^321020971 is an apocalyptic number.

321020971 is a deficient number, since it is larger than the sum of its proper divisors (1).

321020971 is an equidigital number, since it uses as much as digits as its factorization.

321020971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 321020971 is about 17917.0581011504. The cubic root of 321020971 is about 684.7170380123.

The spelling of 321020971 in words is "three hundred twenty-one million, twenty thousand, nine hundred seventy-one".