31155011135321 has 4 divisors (see below), whose sum is σ = 31168938277092. Its totient is φ = 31141083993552.

The previous prime is 31155011135239. The next prime is 31155011135323. The reversal of 31155011135321 is 12353111055113.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24547952158921 + 6607058976400 = 4954589^2 + 2570420^2 .

It is a cyclic number.

It is not a de Polignac number, because 31155011135321 - 2³⁸ = 30880133228377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31155011135323) 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, 6963567530 + ... + 6963572003.

It is an arithmetic number, because the mean of its divisors is an integer number (7792234569273).

Almost surely, 2^{31155011135321} is an apocalyptic number.

It is an amenable number.

31155011135321 is a deficient number, since it is larger than the sum of its proper divisors (13927141771).

31155011135321 is a wasteful number, since it uses less digits than its factorization.

31155011135321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13927141770.

The product of its (nonzero) digits is 6750, while the sum is 32.

The spelling of 31155011135321 in words is "thirty-one trillion, one hundred fifty-five billion, eleven million, one hundred thirty-five thousand, three hundred twenty-one".