31121120000 has 90 divisors (see below), whose sum is σ = 77626392228. Its totient is φ = 12448384000.

The previous prime is 31121119993. The next prime is 31121120119. The reversal of 31121120000 is 2112113.

It is a super-2 number, since 2×31121120000² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

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 9 ways as a sum of consecutive naturals, for example, 62747 + ... + 257253.

Almost surely, 2^31121120000 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 31121120000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38813196114).

31121120000 is an abundant number, since it is smaller than the sum of its proper divisors (46505272228).

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

31121120000 is an frugal number, since it uses more digits than its factorization.

31121120000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194543 (or 194514 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 31121120000 its reverse (2112113), we get a palindrome (31123232113).

The spelling of 31121120000 in words is "thirty-one billion, one hundred twenty-one million, one hundred twenty thousand".