331206221 has 8 divisors (see below), whose sum is σ = 334424064. Its totient is φ = 327998160.

The previous prime is 331206199. The next prime is 331206283. The reversal of 331206221 is 122602133.

It is a happy number.

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 331206221 - 2¹⁰ = 331205197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 331206193 and 331206202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331206521) 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, 78071 + ... + 82203.

It is an arithmetic number, because the mean of its divisors is an integer number (41803008).

Almost surely, 2^331206221 is an apocalyptic number.

It is an amenable number.

331206221 is a deficient number, since it is larger than the sum of its proper divisors (3217843).

331206221 is a wasteful number, since it uses less digits than its factorization.

331206221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4891.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 331206221 is about 18199.0719818347. The cubic root of 331206221 is about 691.8832686759.

Adding to 331206221 its reverse (122602133), we get a palindrome (453808354).

The spelling of 331206221 in words is "three hundred thirty-one million, two hundred six thousand, two hundred twenty-one".