1321123013 has 24 divisors (see below), whose sum is σ = 1615255488. Its totient is φ = 1057839552.

The previous prime is 1321123003. The next prime is 1321123039. The reversal of 1321123013 is 3103211231.

It is not a de Polignac number, because 1321123013 - 2¹² = 1321118917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1321122982 and 1321123000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321123003) 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 23 ways as a sum of consecutive naturals, for example, 155081 + ... + 163377.

It is an arithmetic number, because the mean of its divisors is an integer number (67302312).

Almost surely, 2^1321123013 is an apocalyptic number.

It is an amenable number.

1321123013 is a deficient number, since it is larger than the sum of its proper divisors (294132475).

1321123013 is an equidigital number, since it uses as much as digits as its factorization.

1321123013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8393 (or 8370 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1321123013 is about 36347.2559211834. The cubic root of 1321123013 is about 1097.2723086237.

Adding to 1321123013 its reverse (3103211231), we get a palindrome (4424334244).

The spelling of 1321123013 in words is "one billion, three hundred twenty-one million, one hundred twenty-three thousand, thirteen".