2112801921 has 16 divisors (see below), whose sum is σ = 3130902720. Its totient is φ = 1408163040.

The previous prime is 2112801913. The next prime is 2112801979. The reversal of 2112801921 is 1291082112.

It is not a de Polignac number, because 2112801921 - 2³ = 2112801913 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2112801421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127261 + ... + 142901.

It is an arithmetic number, because the mean of its divisors is an integer number (195681420).

Almost surely, 2^2112801921 is an apocalyptic number.

It is an amenable number.

2112801921 is a deficient number, since it is larger than the sum of its proper divisors (1018100799).

2112801921 is a wasteful number, since it uses less digits than its factorization.

2112801921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20653 (or 20647 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The square root of 2112801921 is about 45965.2251272633. The cubic root of 2112801921 is about 1283.1760971281.

The spelling of 2112801921 in words is "two billion, one hundred twelve million, eight hundred one thousand, nine hundred twenty-one".