1200012321 has 4 divisors (see below), whose sum is σ = 1600016432. Its totient is φ = 800008212.

The previous prime is 1200012311. The next prime is 1200012323. The reversal of 1200012321 is 1232100021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1200012321 - 2⁷ = 1200012193 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1200012297 and 1200012306.

It is not an unprimeable number, because it can be changed into a prime (1200012323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200002051 + ... + 200002056.

It is an arithmetic number, because the mean of its divisors is an integer number (400004108).

Almost surely, 2^1200012321 is an apocalyptic number.

It is an amenable number.

1200012321 is a deficient number, since it is larger than the sum of its proper divisors (400004111).

1200012321 is an equidigital number, since it uses as much as digits as its factorization.

1200012321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400004110.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1200012321 is about 34641.1939892377. The cubic root of 1200012321 is about 1062.6622061191.

Adding to 1200012321 its reverse (1232100021), we get a palindrome (2432112342).

The spelling of 1200012321 in words is "one billion, two hundred million, twelve thousand, three hundred twenty-one".