12011221321 has 8 divisors (see below), whose sum is σ = 13115513088. Its totient is φ = 10908990000.

The previous prime is 12011221303. The next prime is 12011221331. The reversal of 12011221321 is 12312211021.

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

It is a cyclic number.

It is not a de Polignac number, because 12011221321 - 2⁵ = 12011221289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12011221295 and 12011221304.

It is not an unprimeable number, because it can be changed into a prime (12011221331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 502905 + ... + 526246.

It is an arithmetic number, because the mean of its divisors is an integer number (1639439136).

Almost surely, 2^12011221321 is an apocalyptic number.

12011221321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12011221321 is a deficient number, since it is larger than the sum of its proper divisors (1104291767).

12011221321 is a wasteful number, since it uses less digits than its factorization.

12011221321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1030223.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 12011221321 its reverse (12312211021), we get a palindrome (24323432342).

It can be divided in two parts, 12011 and 221321, that added together give a palindrome (233332).

The spelling of 12011221321 in words is "twelve billion, eleven million, two hundred twenty-one thousand, three hundred twenty-one".