31020232221 has 24 divisors (see below), whose sum is σ = 48966060000. Its totient is φ = 18767181600.

The previous prime is 31020232183. The next prime is 31020232237. The reversal of 31020232221 is 12223202013.

It is not a de Polignac number, because 31020232221 - 2⁶ = 31020232157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31020232194 and 31020232203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31020232241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 217846 + ... + 330903.

It is an arithmetic number, because the mean of its divisors is an integer number (2040252500).

Almost surely, 2^31020232221 is an apocalyptic number.

It is an amenable number.

31020232221 is a deficient number, since it is larger than the sum of its proper divisors (17945827779).

31020232221 is a wasteful number, since it uses less digits than its factorization.

31020232221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549337 (or 549334 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 31020232221 its reverse (12223202013), we get a palindrome (43243434234).

The spelling of 31020232221 in words is "thirty-one billion, twenty million, two hundred thirty-two thousand, two hundred twenty-one".