4512131221 has 8 divisors (see below), whose sum is σ = 4977736344. Its totient is φ = 4063457280.

The previous prime is 4512131213. The next prime is 4512131233. The reversal of 4512131221 is 1221312154.

It can be written as a sum of positive squares in 4 ways, for example, as 369792900 + 4142338321 = 19230^2 + 64361^2 .

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 4512131221 - 2³ = 4512131213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4512131192 and 4512131201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4512132221) 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, 4232236 + ... + 4233301.

It is an arithmetic number, because the mean of its divisors is an integer number (622217043).

Almost surely, 2^4512131221 is an apocalyptic number.

4512131221 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

4512131221 is a deficient number, since it is larger than the sum of its proper divisors (465605123).

4512131221 is a wasteful number, since it uses less digits than its factorization.

4512131221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8465591.

The product of its digits is 480, while the sum is 22.

The square root of 4512131221 is about 67172.3992499896. The cubic root of 4512131221 is about 1652.4458640009.

Adding to 4512131221 its reverse (1221312154), we get a palindrome (5733443375).

The spelling of 4512131221 in words is "four billion, five hundred twelve million, one hundred thirty-one thousand, two hundred twenty-one".