31144134133220 has 24 divisors (see below), whose sum is σ = 68844928084800. Its totient is φ = 11801987671392.

The previous prime is 31144134133193. The next prime is 31144134133241. The reversal of 31144134133220 is 2233143144113.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40979123480 + ... + 40979124239.

It is an arithmetic number, because the mean of its divisors is an integer number (2868538670200).

Almost surely, 2^{31144134133220} is an apocalyptic number.

It is an amenable number.

31144134133220 is an abundant number, since it is smaller than the sum of its proper divisors (37700793951580).

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

31144134133220 is a wasteful number, since it uses less digits than its factorization.

31144134133220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81958247747 (or 81958247745 counting only the distinct ones).

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

Adding to 31144134133220 its reverse (2233143144113), we get a palindrome (33377277277333).

The spelling of 31144134133220 in words is "thirty-one trillion, one hundred forty-four billion, one hundred thirty-four million, one hundred thirty-three thousand, two hundred twenty".