2121112028 has 12 divisors (see below), whose sum is σ = 4242224112. Its totient is φ = 909048000.

The previous prime is 2121112027. The next prime is 2121112043. The reversal of 2121112028 is 8202111212.

2121112028 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121112027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37876973 + ... + 37877028.

It is an arithmetic number, because the mean of its divisors is an integer number (353518676).

Almost surely, 2^2121112028 is an apocalyptic number.

2121112028 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2121112028 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2121112028 is a wasteful number, since it uses less digits than its factorization.

2121112028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75754012 (or 75754010 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 2121112028 is about 46055.5320021385. The cubic root of 2121112028 is about 1284.8562326604.

The spelling of 2121112028 in words is "two billion, one hundred twenty-one million, one hundred twelve thousand, twenty-eight".