31121310000 has 200 divisors, whose sum is σ = 109597967424. Its totient is φ = 7544480000.

The previous prime is 31121309987. The next prime is 31121310001. The reversal of 31121310000 is 1312113.

It is a tau number, because it is divible by the number of its divisors (200).

It is a super-2 number, since 2×31121310000² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (31121310001) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 282847 + ... + 377153.

Almost surely, 2^31121310000 is an apocalyptic number.

31121310000 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 31121310000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54798983712).

31121310000 is an abundant number, since it is smaller than the sum of its proper divisors (78476657424).

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

31121310000 is a wasteful number, since it uses less digits than its factorization.

31121310000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94349 (or 94328 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 12.

Adding to 31121310000 its reverse (1312113), we get a palindrome (31122622113).

The spelling of 31121310000 in words is "thirty-one billion, one hundred twenty-one million, three hundred ten thousand".