31011231320221 has 8 divisors (see below), whose sum is σ = 33234128043264. Its totient is φ = 28861216457040.

The previous prime is 31011231320213. The next prime is 31011231320227. The reversal of 31011231320221 is 12202313211013.

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 31011231320221 - 2³ = 31011231320213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31011231320192 and 31011231320201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31011231320227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18220464085 + ... + 18220465786.

It is an arithmetic number, because the mean of its divisors is an integer number (4154266005408).

Almost surely, 2^{31011231320221} is an apocalyptic number.

It is an amenable number.

31011231320221 is a deficient number, since it is larger than the sum of its proper divisors (2222896723043).

31011231320221 is a wasteful number, since it uses less digits than its factorization.

31011231320221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36440929931.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 31011231320221 its reverse (12202313211013), we get a palindrome (43213544531234).

The spelling of 31011231320221 in words is "thirty-one trillion, eleven billion, two hundred thirty-one million, three hundred twenty thousand, two hundred twenty-one".