31003231013021 has 4 divisors (see below), whose sum is σ = 31662874226112. Its totient is φ = 30343587799932.

The previous prime is 31003231013003. The next prime is 31003231013177. The reversal of 31003231013021 is 12031013230013.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31003231013021 is a prime.

It is a super-2 number, since 2×31003231013021² (a number of 28 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 = 31003231012984 and 31003231013002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31003231018021) 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 3 ways as a sum of consecutive naturals, for example, 329821606475 + ... + 329821606568.

It is an arithmetic number, because the mean of its divisors is an integer number (7915718556528).

Almost surely, 2^{31003231013021} is an apocalyptic number.

It is an amenable number.

31003231013021 is a deficient number, since it is larger than the sum of its proper divisors (659643213091).

31003231013021 is an equidigital number, since it uses as much as digits as its factorization.

31003231013021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659643213090.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31003231013021 its reverse (12031013230013), we get a palindrome (43034244243034).

The spelling of 31003231013021 in words is "thirty-one trillion, three billion, two hundred thirty-one million, thirteen thousand, twenty-one".