321221013073 has 2 divisors, whose sum is σ = 321221013074. Its totient is φ = 321221013072.

The previous prime is 321221013011. The next prime is 321221013083. The reversal of 321221013073 is 370310122123.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 293182180369 + 28038832704 = 541463^2 + 167448^2 .

It is a cyclic number.

It is not a de Polignac number, because 321221013073 - 2²⁹ = 320684142161 is a prime.

It is not a weakly prime, because it can be changed into another prime (321221013083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160610506536 + 160610506537.

It is an arithmetic number, because the mean of its divisors is an integer number (160610506537).

Almost surely, 2^321221013073 is an apocalyptic number.

It is an amenable number.

321221013073 is a deficient number, since it is larger than the sum of its proper divisors (1).

321221013073 is an equidigital number, since it uses as much as digits as its factorization.

321221013073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 25.

Adding to 321221013073 its reverse (370310122123), we get a palindrome (691531135196).

The spelling of 321221013073 in words is "three hundred twenty-one billion, two hundred twenty-one million, thirteen thousand, seventy-three".