331211000221 has 4 divisors (see below), whose sum is σ = 350694000252. Its totient is φ = 311728000192.

The previous prime is 331211000207. The next prime is 331211000303. The reversal of 331211000221 is 122000112133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122000112133 = 1361 ⋅89640053.

It can be written as a sum of positive squares in 2 ways, for example, as 160901265625 + 170309734596 = 401125^2 + 412686^2 .

It is a cyclic number.

It is not a de Polignac number, because 331211000221 - 2²⁵ = 331177445789 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 331211000195 and 331211000204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331211000201) 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, 9741499990 + ... + 9741500023.

It is an arithmetic number, because the mean of its divisors is an integer number (87673500063).

Almost surely, 2^331211000221 is an apocalyptic number.

It is an amenable number.

331211000221 is a deficient number, since it is larger than the sum of its proper divisors (19483000031).

331211000221 is a wasteful number, since it uses less digits than its factorization.

331211000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19483000030.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 331211000221 its reverse (122000112133), we get a palindrome (453211112354).

The spelling of 331211000221 in words is "three hundred thirty-one billion, two hundred eleven million, two hundred twenty-one", and thus it is an aban number.