31133330221 has 16 divisors (see below), whose sum is σ = 35960609664. Its totient is φ = 26401621824.

The previous prime is 31133330159. The next prime is 31133330233. The reversal of 31133330221 is 12203333113.

It is a cyclic number.

It is not a de Polignac number, because 31133330221 - 2⁹ = 31133329709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31133330192 and 31133330201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31133330281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 552091 + ... + 605863.

It is an arithmetic number, because the mean of its divisors is an integer number (2247538104).

Almost surely, 2^31133330221 is an apocalyptic number.

It is an amenable number.

31133330221 is a deficient number, since it is larger than the sum of its proper divisors (4827279443).

31133330221 is a wasteful number, since it uses less digits than its factorization.

31133330221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54660.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 31133330221 its reverse (12203333113), we get a palindrome (43336663334).

The spelling of 31133330221 in words is "thirty-one billion, one hundred thirty-three million, three hundred thirty thousand, two hundred twenty-one".