31144021232213 has 4 divisors (see below), whose sum is σ = 31254854048268. Its totient is φ = 31033188416160.

The previous prime is 31144021232087. The next prime is 31144021232287. The reversal of 31144021232213 is 31223212044113.

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 17881590767569 + 13262430464644 = 4228663^2 + 3641762^2 .

It is a cyclic number.

It is not a de Polignac number, because 31144021232213 - 2⁸ = 31144021231957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31144021832213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55416407606 + ... + 55416408167.

It is an arithmetic number, because the mean of its divisors is an integer number (7813713512067).

Almost surely, 2^{31144021232213} is an apocalyptic number.

It is an amenable number.

31144021232213 is a deficient number, since it is larger than the sum of its proper divisors (110832816055).

31144021232213 is a wasteful number, since it uses less digits than its factorization.

31144021232213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110832816054.

The product of its (nonzero) digits is 6912, while the sum is 29.

Adding to 31144021232213 its reverse (31223212044113), we get a palindrome (62367233276326).

The spelling of 31144021232213 in words is "thirty-one trillion, one hundred forty-four billion, twenty-one million, two hundred thirty-two thousand, two hundred thirteen".