31103232221 has 8 divisors (see below), whose sum is σ = 32178497400. Its totient is φ = 30028149760.

The previous prime is 31103232197. The next prime is 31103232247. The reversal of 31103232221 is 12223230113.

It can be written as a sum of positive squares in 4 ways, for example, as 16605625 + 31086626596 = 4075^2 + 176314^2 .

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

It is not a de Polignac number, because 31103232221 - 2⁶ = 31103232157 is a prime.

It is a super-2 number, since 2×31103232221² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31103232193 and 31103232202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31103232271) 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, 362645 + ... + 440133.

It is an arithmetic number, because the mean of its divisors is an integer number (4022312175).

Almost surely, 2^31103232221 is an apocalyptic number.

It is an amenable number.

31103232221 is a deficient number, since it is larger than the sum of its proper divisors (1075265179).

31103232221 is a wasteful number, since it uses less digits than its factorization.

31103232221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91359.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31103232221 its reverse (12223230113), we get a palindrome (43326462334).

The spelling of 31103232221 in words is "thirty-one billion, one hundred three million, two hundred thirty-two thousand, two hundred twenty-one".