4661331221 has 4 divisors (see below), whose sum is σ = 4689243552. Its totient is φ = 4633418892.

The previous prime is 4661331197. The next prime is 4661331289. The reversal of 4661331221 is 1221331664.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4661331221 - 2¹⁴ = 4661314837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4661331421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13955915 + ... + 13956248.

It is an arithmetic number, because the mean of its divisors is an integer number (1172310888).

Almost surely, 2^4661331221 is an apocalyptic number.

It is an amenable number.

4661331221 is a deficient number, since it is larger than the sum of its proper divisors (27912331).

4661331221 is a wasteful number, since it uses less digits than its factorization.

4661331221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27912330.

The product of its digits is 5184, while the sum is 29.

The square root of 4661331221 is about 68273.9424744170. The cubic root of 4661331221 is about 1670.4622073920.

Adding to 4661331221 its reverse (1221331664), we get a palindrome (5882662885).

The spelling of 4661331221 in words is "four billion, six hundred sixty-one million, three hundred thirty-one thousand, two hundred twenty-one".