321145343501 has 2 divisors, whose sum is σ = 321145343502. Its totient is φ = 321145343500.

The previous prime is 321145343419. The next prime is 321145343507. The reversal of 321145343501 is 105343541123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 319439736100 + 1705607401 = 565190^2 + 41299^2 .

It is an emirp because it is prime and its reverse (105343541123) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321145343501 is a prime.

It is a super-3 number, since 3×321145343501³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321145343507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160572671750 + 160572671751.

It is an arithmetic number, because the mean of its divisors is an integer number (160572671751).

Almost surely, 2^321145343501 is an apocalyptic number.

It is an amenable number.

321145343501 is a deficient number, since it is larger than the sum of its proper divisors (1).

321145343501 is an equidigital number, since it uses as much as digits as its factorization.

321145343501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 32.

Adding to 321145343501 its reverse (105343541123), we get a palindrome (426488884624).

The spelling of 321145343501 in words is "three hundred twenty-one billion, one hundred forty-five million, three hundred forty-three thousand, five hundred one".