331323223221 has 6 divisors (see below), whose sum is σ = 478577989110. Its totient is φ = 220882148808.

The previous prime is 331323223219. The next prime is 331323223223. The reversal of 331323223221 is 122322323133.

331323223221 is a `hidden beast` number, since 3 + 3 + 13 + 2 + 322 + 322 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (331323223219) and next prime (331323223223).

It can be written as a sum of positive squares in only one way, i.e., 312748259121 + 18574964100 = 559239^2 + 136290^2 .

It is not a de Polignac number, because 331323223221 - 2¹ = 331323223219 is a prime.

It is a super-2 number, since 2×331323223221² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331323223223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18406845726 + ... + 18406845743.

It is an arithmetic number, because the mean of its divisors is an integer number (79762998185).

Almost surely, 2^331323223221 is an apocalyptic number.

It is an amenable number.

331323223221 is a deficient number, since it is larger than the sum of its proper divisors (147254765889).

331323223221 is a wasteful number, since it uses less digits than its factorization.

331323223221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36813691475 (or 36813691472 counting only the distinct ones).

The product of its digits is 7776, while the sum is 27.

Adding to 331323223221 its reverse (122322323133), we get a palindrome (453645546354).

The spelling of 331323223221 in words is "three hundred thirty-one billion, three hundred twenty-three million, two hundred twenty-three thousand, two hundred twenty-one".