1221323121101 has 2 divisors, whose sum is σ = 1221323121102. Its totient is φ = 1221323121100.

The previous prime is 1221323121077. The next prime is 1221323121133. The reversal of 1221323121101 is 1011213231221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 969730593001 + 251592528100 = 984749^2 + 501590^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221323121101 - 2³⁰ = 1220249379277 is a prime.

It is a super-2 number, since 2×1221323121101² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221323111101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610661560550 + 610661560551.

It is an arithmetic number, because the mean of its divisors is an integer number (610661560551).

Almost surely, 2^{1221323121101} is an apocalyptic number.

It is an amenable number.

1221323121101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221323121101 is an equidigital number, since it uses as much as digits as its factorization.

1221323121101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 1221323121101 its reverse (1011213231221), we get a palindrome (2232536352322).

The spelling of 1221323121101 in words is "one trillion, two hundred twenty-one billion, three hundred twenty-three million, one hundred twenty-one thousand, one hundred one".