31132311321 has 16 divisors (see below), whose sum is σ = 42229958400. Its totient is φ = 20396249808.

The previous prime is 31132311313. The next prime is 31132311349. The reversal of 31132311321 is 12311323113.

It is a happy number.

It is not a de Polignac number, because 31132311321 - 2³ = 31132311313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31132311121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100611 + ... + 269048.

It is an arithmetic number, because the mean of its divisors is an integer number (2639372400).

Almost surely, 2^31132311321 is an apocalyptic number.

It is an amenable number.

31132311321 is a deficient number, since it is larger than the sum of its proper divisors (11097647079).

31132311321 is a wasteful number, since it uses less digits than its factorization.

31132311321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370148.

The product of its digits is 324, while the sum is 21.

Adding to 31132311321 its reverse (12311323113), we get a palindrome (43443634434).

The spelling of 31132311321 in words is "thirty-one billion, one hundred thirty-two million, three hundred eleven thousand, three hundred twenty-one".