6641223121 has 8 divisors (see below), whose sum is σ = 7528512320. Its totient is φ = 5807709072.

The previous prime is 6641223109. The next prime is 6641223133. The reversal of 6641223121 is 1213221466.

It is an interprime number because it is at equal distance from previous prime (6641223109) and next prime (6641223133).

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 6641223121 - 2⁵ = 6641223089 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6641223121.

It is not an unprimeable number, because it can be changed into a prime (6641223151) 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, 13443525 + ... + 13444018.

It is an arithmetic number, because the mean of its divisors is an integer number (941064040).

Almost surely, 2^6641223121 is an apocalyptic number.

It is an amenable number.

6641223121 is a deficient number, since it is larger than the sum of its proper divisors (887289199).

6641223121 is a wasteful number, since it uses less digits than its factorization.

6641223121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26887575.

The product of its digits is 3456, while the sum is 28.

The square root of 6641223121 is about 81493.6998853286. The cubic root of 6641223121 is about 1879.6746759583.

Adding to 6641223121 its reverse (1213221466), we get a palindrome (7854444587).

The spelling of 6641223121 in words is "six billion, six hundred forty-one million, two hundred twenty-three thousand, one hundred twenty-one".