321145402709 has 2 divisors, whose sum is σ = 321145402710. Its totient is φ = 321145402708.

The previous prime is 321145402667. The next prime is 321145402807. The reversal of 321145402709 is 907204541123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 273262335025 + 47883067684 = 522745^2 + 218822^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321145402709 is a prime.

It is a super-2 number, since 2×321145402709² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321145452709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160572701354 + 160572701355.

It is an arithmetic number, because the mean of its divisors is an integer number (160572701355).

Almost surely, 2^321145402709 is an apocalyptic number.

It is an amenable number.

321145402709 is a deficient number, since it is larger than the sum of its proper divisors (1).

321145402709 is an equidigital number, since it uses as much as digits as its factorization.

321145402709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 38.

The spelling of 321145402709 in words is "three hundred twenty-one billion, one hundred forty-five million, four hundred two thousand, seven hundred nine".