2121019998 has 16 divisors (see below), whose sum is σ = 4284041616. Its totient is φ = 700006400.

The previous prime is 2121019997. The next prime is 2121020039. The reversal of 2121019998 is 8999101212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121019993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1749411 + ... + 1750622.

It is an arithmetic number, because the mean of its divisors is an integer number (267752601).

Almost surely, 2^2121019998 is an apocalyptic number.

2121019998 is an abundant number, since it is smaller than the sum of its proper divisors (2163021618).

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

2121019998 is a wasteful number, since it uses less digits than its factorization.

2121019998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3500139.

The product of its (nonzero) digits is 23328, while the sum is 42.

The square root of 2121019998 is about 46054.5328713689. The cubic root of 2121019998 is about 1284.8376501075.

The spelling of 2121019998 in words is "two billion, one hundred twenty-one million, nineteen thousand, nine hundred ninety-eight".