1323123121 has 24 divisors (see below), whose sum is σ = 1453676544. Its totient is φ = 1202800320.

The previous prime is 1323123103. The next prime is 1323123133. The reversal of 1323123121 is 1213213231.

It is not a de Polignac number, because 1323123121 - 2¹³ = 1323114929 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1323123101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1532736 + ... + 1533598.

It is an arithmetic number, because the mean of its divisors is an integer number (60569856).

Almost surely, 2^1323123121 is an apocalyptic number.

It is an amenable number.

1323123121 is a deficient number, since it is larger than the sum of its proper divisors (130553423).

1323123121 is a wasteful number, since it uses less digits than its factorization.

1323123121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069 (or 1050 counting only the distinct ones).

The product of its digits is 216, while the sum is 19.

The square root of 1323123121 is about 36374.7593943933. The cubic root of 1323123121 is about 1097.8257661742.

Adding to 1323123121 its reverse (1213213231), we get a palindrome (2536336352).

The spelling of 1323123121 in words is "one billion, three hundred twenty-three million, one hundred twenty-three thousand, one hundred twenty-one".