1221001123373 has 2 divisors, whose sum is σ = 1221001123374. Its totient is φ = 1221001123372.

The previous prime is 1221001123369. The next prime is 1221001123379. The reversal of 1221001123373 is 3733211001221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1141985037769 + 79016085604 = 1068637^2 + 281098^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221001123373 - 2² = 1221001123369 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221001123379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610500561686 + 610500561687.

It is an arithmetic number, because the mean of its divisors is an integer number (610500561687).

Almost surely, 2^{1221001123373} is an apocalyptic number.

It is an amenable number.

1221001123373 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221001123373 is an equidigital number, since it uses as much as digits as its factorization.

1221001123373 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 26.

Adding to 1221001123373 its reverse (3733211001221), we get a palindrome (4954212124594).

The spelling of 1221001123373 in words is "one trillion, two hundred twenty-one billion, one million, one hundred twenty-three thousand, three hundred seventy-three".