31130021101321 has 4 divisors (see below), whose sum is σ = 31130291060752. Its totient is φ = 31129751141892.

The previous prime is 31130021101307. The next prime is 31130021101349. The reversal of 31130021101321 is 12310112003113.

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 not a de Polignac number, because 31130021101321 - 2⁹ = 31130021100809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31130021101301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134806671 + ... + 135037396.

It is an arithmetic number, because the mean of its divisors is an integer number (7782572765188).

Almost surely, 2^{31130021101321} is an apocalyptic number.

It is an amenable number.

31130021101321 is a deficient number, since it is larger than the sum of its proper divisors (269959431).

31130021101321 is a wasteful number, since it uses less digits than its factorization.

31130021101321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269959430.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 31130021101321 its reverse (12310112003113), we get a palindrome (43440133104434).

The spelling of 31130021101321 in words is "thirty-one trillion, one hundred thirty billion, twenty-one million, one hundred one thousand, three hundred twenty-one".