4145204331221 has 8 divisors (see below), whose sum is σ = 4160599695000. Its totient is φ = 4129822674432.

The previous prime is 4145204331199. The next prime is 4145204331259. The reversal of 4145204331221 is 1221334025414.

It can be written as a sum of positive squares in 4 ways, for example, as 330061740100 + 3815142591121 = 574510^2 + 1953239^2 .

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 4145204331221 - 2¹⁴ = 4145204314837 is a prime.

It is a super-3 number, since 3×4145204331221³ (a number of 39 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4145204331271) 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, 2820596 + ... + 4030653.

It is an arithmetic number, because the mean of its divisors is an integer number (520074961875).

Almost surely, 2^{4145204331221} is an apocalyptic number.

It is an amenable number.

4145204331221 is a deficient number, since it is larger than the sum of its proper divisors (15395363779).

4145204331221 is a wasteful number, since it uses less digits than its factorization.

4145204331221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6853495.

The product of its (nonzero) digits is 23040, while the sum is 32.

Adding to 4145204331221 its reverse (1221334025414), we get a palindrome (5366538356635).

The spelling of 4145204331221 in words is "four trillion, one hundred forty-five billion, two hundred four million, three hundred thirty-one thousand, two hundred twenty-one".