1321201231123 has 4 divisors (see below), whose sum is σ = 1321231438648. Its totient is φ = 1321171023600.

The previous prime is 1321201231093. The next prime is 1321201231127. The reversal of 1321201231123 is 3211321021231.

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 1321201231123 - 2³⁷ = 1183762277651 is a prime.

It is a super-2 number, since 2×1321201231123² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1321201231094 and 1321201231103.

It is not an unprimeable number, because it can be changed into a prime (1321201231127) 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, 15038061 + ... + 15125662.

It is an arithmetic number, because the mean of its divisors is an integer number (330307859662).

Almost surely, 2^{1321201231123} is an apocalyptic number.

1321201231123 is a deficient number, since it is larger than the sum of its proper divisors (30207525).

1321201231123 is an equidigital number, since it uses as much as digits as its factorization.

1321201231123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30207524.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 1321201231123 its reverse (3211321021231), we get a palindrome (4532522252354).

The spelling of 1321201231123 in words is "one trillion, three hundred twenty-one billion, two hundred one million, two hundred thirty-one thousand, one hundred twenty-three".