31023103021 has 8 divisors (see below), whose sum is σ = 32853485304. Its totient is φ = 29193331200.

The previous prime is 31023103019. The next prime is 31023103031. The reversal of 31023103021 is 12030132013.

It can be written as a sum of positive squares in 4 ways, for example, as 6019587396 + 25003515625 = 77586^2 + 158125^2 .

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 31023103021 - 2¹ = 31023103019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31023102986 and 31023103004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31023103031) 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, 45840 + ... + 253273.

It is an arithmetic number, because the mean of its divisors is an integer number (4106685663).

Almost surely, 2^31023103021 is an apocalyptic number.

It is an amenable number.

31023103021 is a deficient number, since it is larger than the sum of its proper divisors (1830382283).

31023103021 is a wasteful number, since it uses less digits than its factorization.

31023103021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305231.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31023103021 its reverse (12030132013), we get a palindrome (43053235034).

The spelling of 31023103021 in words is "thirty-one billion, twenty-three million, one hundred three thousand, twenty-one".