331331213221 has 8 divisors (see below), whose sum is σ = 343039033080. Its totient is φ = 319642233792.

The previous prime is 331331213219. The next prime is 331331213249. The reversal of 331331213221 is 122312133133.

It can be written as a sum of positive squares in 4 ways, for example, as 21020940196 + 310310273025 = 144986^2 + 557055^2 .

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 331331213221 - 2¹ = 331331213219 is a prime.

It is a super-3 number, since 3×331331213221³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331331213281) 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, 4674310 + ... + 4744663.

It is an arithmetic number, because the mean of its divisors is an integer number (42879879135).

Almost surely, 2^331331213221 is an apocalyptic number.

It is an amenable number.

331331213221 is a deficient number, since it is larger than the sum of its proper divisors (11707819859).

331331213221 is a wasteful number, since it uses less digits than its factorization.

331331213221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9420215.

The product of its digits is 1944, while the sum is 25.

Adding to 331331213221 its reverse (122312133133), we get a palindrome (453643346354).

The spelling of 331331213221 in words is "three hundred thirty-one billion, three hundred thirty-one million, two hundred thirteen thousand, two hundred twenty-one".