31213212222113 has 4 divisors (see below), whose sum is σ = 31499571967380. Its totient is φ = 30926852476848.

The previous prime is 31213212222107. The next prime is 31213212222119. The reversal of 31213212222113 is 31122221231213.

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

It is an interprime number because it is at equal distance from previous prime (31213212222107) and next prime (31213212222119).

It can be written as a sum of positive squares in 2 ways, for example, as 21272232025489 + 9940980196624 = 4612183^2 + 3152932^2 .

It is a cyclic number.

It is not a de Polignac number, because 31213212222113 - 2⁴ = 31213212222097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31213212222119) 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, 143179872470 + ... + 143179872687.

It is an arithmetic number, because the mean of its divisors is an integer number (7874892991845).

Almost surely, 2^{31213212222113} is an apocalyptic number.

It is an amenable number.

31213212222113 is a deficient number, since it is larger than the sum of its proper divisors (286359745267).

31213212222113 is a wasteful number, since it uses less digits than its factorization.

31213212222113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286359745266.

The product of its digits is 1728, while the sum is 26.

Adding to 31213212222113 its reverse (31122221231213), we get a palindrome (62335433453326).

The spelling of 31213212222113 in words is "thirty-one trillion, two hundred thirteen billion, two hundred twelve million, two hundred twenty-two thousand, one hundred thirteen".