1221033110423 has 4 divisors (see below), whose sum is σ = 1395466411920. Its totient is φ = 1046599808928.

The previous prime is 1221033110419. The next prime is 1221033110441. The reversal of 1221033110423 is 3240113301221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221033110423 - 2² = 1221033110419 is a prime.

It is a super-2 number, since 2×1221033110423² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221033110413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87216650738 + ... + 87216650751.

It is an arithmetic number, because the mean of its divisors is an integer number (348866602980).

Almost surely, 2^{1221033110423} is an apocalyptic number.

1221033110423 is a deficient number, since it is larger than the sum of its proper divisors (174433301497).

1221033110423 is an equidigital number, since it uses as much as digits as its factorization.

1221033110423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174433301496.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 1221033110423 its reverse (3240113301221), we get a palindrome (4461146411644).

The spelling of 1221033110423 in words is "one trillion, two hundred twenty-one billion, thirty-three million, one hundred ten thousand, four hundred twenty-three".