31112331211221 has 8 divisors (see below), whose sum is σ = 44674116611040. Its totient is φ = 19146049976112.

The previous prime is 31112331211217. The next prime is 31112331211261. The reversal of 31112331211221 is 12211213321113.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31112331211221 - 2² = 31112331211217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31112331211191 and 31112331211200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31112331211211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 398876041131 + ... + 398876041208.

It is an arithmetic number, because the mean of its divisors is an integer number (5584264576380).

Almost surely, 2^{31112331211221} is an apocalyptic number.

It is an amenable number.

31112331211221 is a deficient number, since it is larger than the sum of its proper divisors (13561785399819).

31112331211221 is a wasteful number, since it uses less digits than its factorization.

31112331211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797752082355.

The product of its digits is 432, while the sum is 24.

Adding to 31112331211221 its reverse (12211213321113), we get a palindrome (43323544532334).

The spelling of 31112331211221 in words is "thirty-one trillion, one hundred twelve billion, three hundred thirty-one million, two hundred eleven thousand, two hundred twenty-one".