31213344133420 has 24 divisors (see below), whose sum is σ = 67662475026048. Its totient is φ = 12082584825600.

The previous prime is 31213344133403. The next prime is 31213344133423. The reversal of 31213344133420 is 2433144331213.

It is not an unprimeable number, because it can be changed into a prime (31213344133423) 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 7 ways as a sum of consecutive naturals, for example, 25172051101 + ... + 25172052340.

It is an arithmetic number, because the mean of its divisors is an integer number (2819269792752).

Almost surely, 2^{31213344133420} is an apocalyptic number.

It is an amenable number.

31213344133420 is an abundant number, since it is smaller than the sum of its proper divisors (36449130892628).

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

31213344133420 is a wasteful number, since it uses less digits than its factorization.

31213344133420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50344103481 (or 50344103479 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 34.

Adding to 31213344133420 its reverse (2433144331213), we get a palindrome (33646488464633).

The spelling of 31213344133420 in words is "thirty-one trillion, two hundred thirteen billion, three hundred forty-four million, one hundred thirty-three thousand, four hundred twenty".