31220123241340 has 24 divisors (see below), whose sum is σ = 71522464153392. Its totient is φ = 11352772087680.

The previous prime is 31220123241313. The next prime is 31220123241343. The reversal of 31220123241340 is 4314232102213.

It is a junction number, because it is equal to n+sod(n) for n = 31220123241299 and 31220123241308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220123241343) 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, 70954825329 + ... + 70954825768.

It is an arithmetic number, because the mean of its divisors is an integer number (2980102673058).

Almost surely, 2^{31220123241340} is an apocalyptic number.

It is an amenable number.

31220123241340 is an abundant number, since it is smaller than the sum of its proper divisors (40302340912052).

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

31220123241340 is a wasteful number, since it uses less digits than its factorization.

31220123241340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141909651117 (or 141909651115 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 31220123241340 its reverse (4314232102213), we get a palindrome (35534355343553).

The spelling of 31220123241340 in words is "thirty-one trillion, two hundred twenty billion, one hundred twenty-three million, two hundred forty-one thousand, three hundred forty".