331010221 has 4 divisors (see below), whose sum is σ = 333426492. Its totient is φ = 328593952.

The previous prime is 331010209. The next prime is 331010233. The reversal of 331010221 is 122010133.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (331010209) and next prime (331010233).

It can be written as a sum of positive squares in 2 ways, for example, as 103754596 + 227255625 = 10186^2 + 15075^2 .

It is not a de Polignac number, because 331010221 - 2⁵ = 331010189 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 (331010021) 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, 1207930 + ... + 1208203.

It is an arithmetic number, because the mean of its divisors is an integer number (83356623).

Almost surely, 2^331010221 is an apocalyptic number.

It is an amenable number.

331010221 is a deficient number, since it is larger than the sum of its proper divisors (2416271).

331010221 is a wasteful number, since it uses less digits than its factorization.

331010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2416270.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 331010221 is about 18193.6862949761. The cubic root of 331010221 is about 691.7467616993.

Adding to 331010221 its reverse (122010133), we get a palindrome (453020354).

It can be divided in two parts, 3310 and 10221, that added together give a palindrome (13531).

The spelling of 331010221 in words is "three hundred thirty-one million, ten thousand, two hundred twenty-one".