31111013222213 has 4 divisors (see below), whose sum is σ = 31460575168620. Its totient is φ = 30761451275808.

The previous prime is 31111013222167. The next prime is 31111013222221. The reversal of 31111013222213 is 31222231011113.

It is a happy number.

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 13049592706084 + 18061420516129 = 3612422^2 + 4249873^2 .

It is a cyclic number.

It is not a de Polignac number, because 31111013222213 - 2¹⁴ = 31111013205829 is a prime.

It is a super-2 number, since 2×31111013222213² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31111013222273) 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, 174780973070 + ... + 174780973247.

It is an arithmetic number, because the mean of its divisors is an integer number (7865143792155).

Almost surely, 2^{31111013222213} is an apocalyptic number.

It is an amenable number.

31111013222213 is a deficient number, since it is larger than the sum of its proper divisors (349561946407).

31111013222213 is an equidigital number, since it uses as much as digits as its factorization.

31111013222213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349561946406.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 31111013222213 its reverse (31222231011113), we get a palindrome (62333244233326).

The spelling of 31111013222213 in words is "thirty-one trillion, one hundred eleven billion, thirteen million, two hundred twenty-two thousand, two hundred thirteen".