1220440231123 has 4 divisors (see below), whose sum is σ = 1220727871528. Its totient is φ = 1220152590720.

The previous prime is 1220440231099. The next prime is 1220440231133. The reversal of 1220440231123 is 3211320440221.

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 1220440231123 - 2²⁹ = 1219903360211 is a prime.

It is a super-2 number, since 2×1220440231123² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220440231133) 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 in 3 ways as a sum of consecutive naturals, for example, 143813838 + ... + 143822323.

It is an arithmetic number, because the mean of its divisors is an integer number (305181967882).

Almost surely, 2^{1220440231123} is an apocalyptic number.

1220440231123 is a deficient number, since it is larger than the sum of its proper divisors (287640405).

1220440231123 is an equidigital number, since it uses as much as digits as its factorization.

1220440231123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287640404.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 1220440231123 its reverse (3211320440221), we get a palindrome (4431760671344).

The spelling of 1220440231123 in words is "one trillion, two hundred twenty billion, four hundred forty million, two hundred thirty-one thousand, one hundred twenty-three".