2112155540 has 48 divisors (see below), whose sum is σ = 4869656064. Its totient is φ = 763152000.

The previous prime is 2112155537. The next prime is 2112155557. The reversal of 2112155540 is 455512112.

It is a super-2 number, since 2×2112155540² = 8922402050305383200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3965 + ... + 65115.

It is an arithmetic number, because the mean of its divisors is an integer number (101451168).

Almost surely, 2^2112155540 is an apocalyptic number.

2112155540 is a gapful number since it is divisible by the number (20) 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 2112155540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2434828032).

2112155540 is an abundant number, since it is smaller than the sum of its proper divisors (2757500524).

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

2112155540 is a wasteful number, since it uses less digits than its factorization.

2112155540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61328 (or 61326 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 26.

The square root of 2112155540 is about 45958.1933935615. The cubic root of 2112155540 is about 1283.0452274303.

Adding to 2112155540 its reverse (455512112), we get a palindrome (2567667652).

The spelling of 2112155540 in words is "two billion, one hundred twelve million, one hundred fifty-five thousand, five hundred forty".