2111511012 has 72 divisors (see below), whose sum is σ = 5351423616. Its totient is φ = 647697024.

The previous prime is 2111510923. The next prime is 2111511013. The reversal of 2111511012 is 2101151112.

It is a junction number, because it is equal to n+sod(n) for n = 2111510982 and 2111511000.

It is not an unprimeable number, because it can be changed into a prime (2111511013) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 742858 + ... + 745694.

It is an arithmetic number, because the mean of its divisors is an integer number (74325328).

Almost surely, 2^2111511012 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 2111511012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2675711808).

2111511012 is an abundant number, since it is smaller than the sum of its proper divisors (3239912604).

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

2111511012 is a wasteful number, since it uses less digits than its factorization.

2111511012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3237 (or 3222 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 15.

The square root of 2111511012 is about 45951.1807465271. The cubic root of 2111511012 is about 1282.9147063128.

Adding to 2111511012 its reverse (2101151112), we get a palindrome (4212662124).

The spelling of 2111511012 in words is "two billion, one hundred eleven million, five hundred eleven thousand, twelve".