31100020112 has 60 divisors (see below), whose sum is σ = 70342234416. Its totient is φ = 13281387840.

The previous prime is 31100020103. The next prime is 31100020153. The reversal of 31100020112 is 21102000113.

It is a super-2 number, since 2×31100020112² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31100020093 and 31100020102.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 151787 + ... + 291957.

Almost surely, 2^31100020112 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 31100020112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35171117208).

31100020112 is an abundant number, since it is smaller than the sum of its proper divisors (39242214304).

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

31100020112 is a wasteful number, since it uses less digits than its factorization.

31100020112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140476 (or 140463 counting only the distinct ones).

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

Adding to 31100020112 its reverse (21102000113), we get a palindrome (52202020225).

The spelling of 31100020112 in words is "thirty-one billion, one hundred million, twenty thousand, one hundred twelve".