1321200123 has 8 divisors (see below), whose sum is σ = 1762789200. Its totient is φ = 880205568.

The previous prime is 1321200121. The next prime is 1321200137. The reversal of 1321200123 is 3210021231.

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

It is not a de Polignac number, because 1321200123 - 2¹ = 1321200121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1321200121) 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 7 ways as a sum of consecutive naturals, for example, 143418 + ... + 152351.

It is an arithmetic number, because the mean of its divisors is an integer number (220348650).

Almost surely, 2^1321200123 is an apocalyptic number.

1321200123 is a deficient number, since it is larger than the sum of its proper divisors (441589077).

1321200123 is a wasteful number, since it uses less digits than its factorization.

1321200123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297261.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1321200123 is about 36348.3166460292. The cubic root of 1321200123 is about 1097.2936563763.

Adding to 1321200123 its reverse (3210021231), we get a palindrome (4531221354).

The spelling of 1321200123 in words is "one billion, three hundred twenty-one million, two hundred thousand, one hundred twenty-three".