321440422021261 has 2 divisors, whose sum is σ = 321440422021262. Its totient is φ = 321440422021260.

The previous prime is 321440422021237. The next prime is 321440422021307. The reversal of 321440422021261 is 162120224044123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 289377863432100 + 32062558589161 = 17011110^2 + 5662381^2 .

It is a cyclic number.

It is not a de Polignac number, because 321440422021261 - 2¹⁵ = 321440421988493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321440422001261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160720211010630 + 160720211010631.

It is an arithmetic number, because the mean of its divisors is an integer number (160720211010631).

Almost surely, 2^{321440422021261} is an apocalyptic number.

It is an amenable number.

321440422021261 is a deficient number, since it is larger than the sum of its proper divisors (1).

321440422021261 is an equidigital number, since it uses as much as digits as its factorization.

321440422021261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36864, while the sum is 34.

Adding to 321440422021261 its reverse (162120224044123), we get a palindrome (483560646065384).

The spelling of 321440422021261 in words is "three hundred twenty-one trillion, four hundred forty billion, four hundred twenty-two million, twenty-one thousand, two hundred sixty-one".