1200220312321 has 4 divisors (see below), whose sum is σ = 1201294816852. Its totient is φ = 1199145807792.

The previous prime is 1200220312301. The next prime is 1200220312393. The reversal of 1200220312321 is 1232130220021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 239379261696 + 960841050625 = 489264^2 + 980225^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200220312321 - 2²¹ = 1200218215169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1200220312301) 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, 537250590 + ... + 537252823.

It is an arithmetic number, because the mean of its divisors is an integer number (300323704213).

Almost surely, 2^{1200220312321} is an apocalyptic number.

It is an amenable number.

1200220312321 is a deficient number, since it is larger than the sum of its proper divisors (1074504531).

1200220312321 is a wasteful number, since it uses less digits than its factorization.

1200220312321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1074504530.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 1200220312321 its reverse (1232130220021), we get a palindrome (2432350532342).

The spelling of 1200220312321 in words is "one trillion, two hundred billion, two hundred twenty million, three hundred twelve thousand, three hundred twenty-one".