31012031021 has 8 divisors (see below), whose sum is σ = 32646249600. Its totient is φ = 29378013120.

The previous prime is 31012030993. The next prime is 31012031081. The reversal of 31012031021 is 12013021013.

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

It is a cyclic number.

It is not a de Polignac number, because 31012031021 - 2⁶ = 31012030957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31012030987 and 31012031005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31012031081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 348245 + ... + 428133.

It is an arithmetic number, because the mean of its divisors is an integer number (4080781200).

Almost surely, 2^31012031021 is an apocalyptic number.

It is an amenable number.

31012031021 is a deficient number, since it is larger than the sum of its proper divisors (1634218579).

31012031021 is a wasteful number, since it uses less digits than its factorization.

31012031021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100339.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 31012031021 its reverse (12013021013), we get a palindrome (43025052034).

The spelling of 31012031021 in words is "thirty-one billion, twelve million, thirty-one thousand, twenty-one".