1221223131323 has 4 divisors (see below), whose sum is σ = 1315163372208. Its totient is φ = 1127282890440.

The previous prime is 1221223131251. The next prime is 1221223131367. The reversal of 1221223131323 is 3231313221221.

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 1221223131323 - 2¹⁶ = 1221223065787 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221223131292 and 1221223131301.

It is not an unprimeable number, because it can be changed into a prime (1221223133323) 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, 46970120423 + ... + 46970120448.

It is an arithmetic number, because the mean of its divisors is an integer number (328790843052).

Almost surely, 2^{1221223131323} is an apocalyptic number.

1221223131323 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1221223131323 is a deficient number, since it is larger than the sum of its proper divisors (93940240885).

1221223131323 is an equidigital number, since it uses as much as digits as its factorization.

1221223131323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93940240884.

The product of its digits is 2592, while the sum is 26.

Adding to 1221223131323 its reverse (3231313221221), we get a palindrome (4452536352544).

The spelling of 1221223131323 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-three million, one hundred thirty-one thousand, three hundred twenty-three".