1321223123 has 8 divisors (see below), whose sum is σ = 1441597440. Its totient is φ = 1200892680.

The previous prime is 1321223107. The next prime is 1321223143. The reversal of 1321223123 is 3213221231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1321223123 - 2⁴ = 1321223107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1321223095 and 1321223104.

It is not an unprimeable number, because it can be changed into a prime (1321223143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111938 + ... + 123176.

It is an arithmetic number, because the mean of its divisors is an integer number (180199680).

Almost surely, 2^1321223123 is an apocalyptic number.

1321223123 is a deficient number, since it is larger than the sum of its proper divisors (120374317).

1321223123 is a wasteful number, since it uses less digits than its factorization.

1321223123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21937.

The product of its digits is 432, while the sum is 20.

The square root of 1321223123 is about 36348.6330279421. The cubic root of 1321223123 is about 1097.3000237204.

Adding to 1321223123 its reverse (3213221231), we get a palindrome (4534444354).

The spelling of 1321223123 in words is "one billion, three hundred twenty-one million, two hundred twenty-three thousand, one hundred twenty-three".