2121783993 has 12 divisors (see below), whose sum is σ = 3502627648. Its totient is φ = 1212447960.

The previous prime is 2121783967. The next prime is 2121783997. The reversal of 2121783993 is 3993871212.

It is not a de Polignac number, because 2121783993 - 2¹⁶ = 2121718457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121783997) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16839493 + ... + 16839618.

Almost surely, 2^2121783993 is an apocalyptic number.

It is an amenable number.

2121783993 is a deficient number, since it is larger than the sum of its proper divisors (1380843655).

2121783993 is a wasteful number, since it uses less digits than its factorization.

2121783993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33679124 (or 33679121 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 2121783993 is about 46062.8265850024. The cubic root of 2121783993 is about 1284.9918984889.

The spelling of 2121783993 in words is "two billion, one hundred twenty-one million, seven hundred eighty-three thousand, nine hundred ninety-three".