1221320111183 has 2 divisors, whose sum is σ = 1221320111184. Its totient is φ = 1221320111182.

The previous prime is 1221320111159. The next prime is 1221320111213. The reversal of 1221320111183 is 3811110231221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221320111183 - 2⁶ = 1221320111119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221320111983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610660055591 + 610660055592.

It is an arithmetic number, because the mean of its divisors is an integer number (610660055592).

Almost surely, 2^{1221320111183} is an apocalyptic number.

1221320111183 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221320111183 is an equidigital number, since it uses as much as digits as its factorization.

1221320111183 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 26.

The spelling of 1221320111183 in words is "one trillion, two hundred twenty-one billion, three hundred twenty million, one hundred eleven thousand, one hundred eighty-three".