31233122221 has 8 divisors (see below), whose sum is σ = 35697943424. Its totient is φ = 26769037680.

The previous prime is 31233122213. The next prime is 31233122303. The reversal of 31233122221 is 12222133213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31233122221 - 2³ = 31233122213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31233122192 and 31233122201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31233422221) 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, 90105 + ... + 265678.

It is an arithmetic number, because the mean of its divisors is an integer number (4462242928).

Almost surely, 2^31233122221 is an apocalyptic number.

It is an amenable number.

31233122221 is a deficient number, since it is larger than the sum of its proper divisors (4464821203).

31233122221 is a wasteful number, since it uses less digits than its factorization.

31233122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368331.

The product of its digits is 864, while the sum is 22.

Adding to 31233122221 its reverse (12222133213), we get a palindrome (43455255434).

The spelling of 31233122221 in words is "thirty-one billion, two hundred thirty-three million, one hundred twenty-two thousand, two hundred twenty-one".