4128821913 has 4 divisors (see below), whose sum is σ = 5505095888. Its totient is φ = 2752547940.

The previous prime is 4128821899. The next prime is 4128821941. The reversal of 4128821913 is 3191288214.

4128821913 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 4128821913 - 2¹⁶ = 4128756377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4128821993) 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, 688136983 + ... + 688136988.

It is an arithmetic number, because the mean of its divisors is an integer number (1376273972).

Almost surely, 2^4128821913 is an apocalyptic number.

It is an amenable number.

4128821913 is a deficient number, since it is larger than the sum of its proper divisors (1376273975).

4128821913 is a wasteful number, since it uses less digits than its factorization.

4128821913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376273974.

The product of its digits is 27648, while the sum is 39.

The square root of 4128821913 is about 64255.9095570205. The cubic root of 4128821913 is about 1604.2623218884.

The spelling of 4128821913 in words is "four billion, one hundred twenty-eight million, eight hundred twenty-one thousand, nine hundred thirteen".