31223212444340 has 96 divisors (see below), whose sum is σ = 75277447870464. Its totient is φ = 10656288990720.

The previous prime is 31223212444331. The next prime is 31223212444351. The reversal of 31223212444340 is 4344421232213.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 31223212444340.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 531366242 + ... + 531424998.

It is an arithmetic number, because the mean of its divisors is an integer number (784140081984).

Almost surely, 2^{31223212444340} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31223212444340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37638723935232).

31223212444340 is an abundant number, since it is smaller than the sum of its proper divisors (44054235426124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31223212444340 is a wasteful number, since it uses less digits than its factorization.

31223212444340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76017 (or 76015 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 35.

Adding to 31223212444340 its reverse (4344421232213), we get a palindrome (35567633676553).

The spelling of 31223212444340 in words is "thirty-one trillion, two hundred twenty-three billion, two hundred twelve million, four hundred forty-four thousand, three hundred forty".