1221300321173 has 2 divisors, whose sum is σ = 1221300321174. Its totient is φ = 1221300321172.

The previous prime is 1221300321127. The next prime is 1221300321179. The reversal of 1221300321173 is 3711230031221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 717303975844 + 503996345329 = 846938^2 + 709927^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221300321173 - 2¹⁴ = 1221300304789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221300321179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610650160586 + 610650160587.

It is an arithmetic number, because the mean of its divisors is an integer number (610650160587).

Almost surely, 2^{1221300321173} is an apocalyptic number.

It is an amenable number.

1221300321173 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221300321173 is an equidigital number, since it uses as much as digits as its factorization.

1221300321173 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 26.

Adding to 1221300321173 its reverse (3711230031221), we get a palindrome (4932530352394).

The spelling of 1221300321173 in words is "one trillion, two hundred twenty-one billion, three hundred million, three hundred twenty-one thousand, one hundred seventy-three".