2232166221 has 48 divisors (see below), whose sum is σ = 3449160000. Its totient is φ = 1426638528.

The previous prime is 2232166219. The next prime is 2232166243. The reversal of 2232166221 is 1226612322.

It is a happy number.

2232166221 is a `hidden beast` number, since 2 + 2 + 32 + 1 + 6 + 622 + 1 = 666.

It is not a de Polignac number, because 2232166221 - 2¹ = 2232166219 is a prime.

It is a super-3 number, since 3×2232166221³ (a number of 29 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2232166271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4473030 + ... + 4473528.

It is an arithmetic number, because the mean of its divisors is an integer number (71857500).

Almost surely, 2^2232166221 is an apocalyptic number.

It is an amenable number.

2232166221 is a deficient number, since it is larger than the sum of its proper divisors (1216993779).

2232166221 is a wasteful number, since it uses less digits than its factorization.

2232166221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 763 (or 728 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 2232166221 is about 47245.8063853291. The cubic root of 2232166221 is about 1306.8994561806.

Adding to 2232166221 its reverse (1226612322), we get a palindrome (3458778543).

The spelling of 2232166221 in words is "two billion, two hundred thirty-two million, one hundred sixty-six thousand, two hundred twenty-one".