31103313021 has 12 divisors (see below), whose sum is σ = 49011281280. Its totient is φ = 18850492680.

The previous prime is 31103312993. The next prime is 31103313029. The reversal of 31103313021 is 12031330113.

It is a happy number.

31103313021 is a `hidden beast` number, since 31 + 1 + 0 + 331 + 302 + 1 = 666.

It is not a de Polignac number, because 31103313021 - 2¹³ = 31103304829 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31103312985 and 31103313003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31103313029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 157087341 + ... + 157087538.

It is an arithmetic number, because the mean of its divisors is an integer number (4084273440).

Almost surely, 2^31103313021 is an apocalyptic number.

It is an amenable number.

31103313021 is a deficient number, since it is larger than the sum of its proper divisors (17907968259).

31103313021 is a wasteful number, since it uses less digits than its factorization.

31103313021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314174896 (or 314174893 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 31103313021 its reverse (12031330113), we get a palindrome (43134643134).

The spelling of 31103313021 in words is "thirty-one billion, one hundred three million, three hundred thirteen thousand, twenty-one".