12031143221 has 8 divisors (see below), whose sum is σ = 12419039160. Its totient is φ = 11646548928.

The previous prime is 12031143217. The next prime is 12031143233. The reversal of 12031143221 is 12234113021.

It can be written as a sum of positive squares in 4 ways, for example, as 10540102225 + 1491040996 = 102665^2 + 38614^2 .

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 12031143221 - 2² = 12031143217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12031143193 and 12031143202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12031145221) 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, 818006 + ... + 832583.

It is an arithmetic number, because the mean of its divisors is an integer number (1552379895).

Almost surely, 2^12031143221 is an apocalyptic number.

It is an amenable number.

12031143221 is a deficient number, since it is larger than the sum of its proper divisors (387895939).

12031143221 is a wasteful number, since it uses less digits than its factorization.

12031143221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1650823.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 12031143221 its reverse (12234113021), we get a palindrome (24265256242).

The spelling of 12031143221 in words is "twelve billion, thirty-one million, one hundred forty-three thousand, two hundred twenty-one".