31143132110220 has 384 divisors, whose sum is σ = 99911410163712. Its totient is φ = 7180395724800.

The previous prime is 31143132110171. The next prime is 31143132110249. The reversal of 31143132110220 is 2201123134113.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2489253765 + ... + 2489266275.

It is an arithmetic number, because the mean of its divisors is an integer number (260185963968).

Almost surely, 2^{31143132110220} is an apocalyptic number.

31143132110220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31143132110220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49955705081856).

31143132110220 is an abundant number, since it is smaller than the sum of its proper divisors (68768278053492).

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

31143132110220 is a wasteful number, since it uses less digits than its factorization.

31143132110220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13441 (or 13439 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 31143132110220 its reverse (2201123134113), we get a palindrome (33344255244333).

The spelling of 31143132110220 in words is "thirty-one trillion, one hundred forty-three billion, one hundred thirty-two million, one hundred ten thousand, two hundred twenty".