4665421221 has 4 divisors (see below), whose sum is σ = 6220561632. Its totient is φ = 3110280812.

The previous prime is 4665421193. The next prime is 4665421237. The reversal of 4665421221 is 1221245664.

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 4665421221 - 2¹¹ = 4665419173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4665421261) 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, 777570201 + ... + 777570206.

It is an arithmetic number, because the mean of its divisors is an integer number (1555140408).

Almost surely, 2^4665421221 is an apocalyptic number.

It is an amenable number.

4665421221 is a deficient number, since it is larger than the sum of its proper divisors (1555140411).

4665421221 is a wasteful number, since it uses less digits than its factorization.

4665421221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1555140410.

The product of its digits is 23040, while the sum is 33.

The square root of 4665421221 is about 68303.8887692348. Note that the first 3 decimals coincide. The cubic root of 4665421221 is about 1670.9506367567.

Adding to 4665421221 its reverse (1221245664), we get a palindrome (5886666885).

The spelling of 4665421221 in words is "four billion, six hundred sixty-five million, four hundred twenty-one thousand, two hundred twenty-one".