31211344133420 has 96 divisors (see below), whose sum is σ = 73975133433600. Its totient is φ = 10957150713600.

The previous prime is 31211344133407. The next prime is 31211344133443. The reversal of 31211344133420 is 2433144311213.

It is a super-2 number, since 2×31211344133420² (a number of 28 digits) contains 22 as substring.

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, 66955511 + ... + 67420049.

It is an arithmetic number, because the mean of its divisors is an integer number (770574306600).

Almost surely, 2^{31211344133420} 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 31211344133420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36987566716800).

31211344133420 is an abundant number, since it is smaller than the sum of its proper divisors (42763789300180).

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

31211344133420 is a wasteful number, since it uses less digits than its factorization.

31211344133420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475119 (or 475117 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

Adding to 31211344133420 its reverse (2433144311213), we get a palindrome (33644488444633).

The spelling of 31211344133420 in words is "thirty-one trillion, two hundred eleven billion, three hundred forty-four million, one hundred thirty-three thousand, four hundred twenty".