2158720441 has 4 divisors (see below), whose sum is σ = 2158814592. Its totient is φ = 2158626292.

The previous prime is 2158720363. The next prime is 2158720477. The reversal of 2158720441 is 1440278512.

2158720441 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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2158720441 - 2⁷ = 2158720313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2158720397 and 2158720406.

It is not an unprimeable number, because it can be changed into a prime (2158720841) 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, 12180 + ... + 66826.

It is an arithmetic number, because the mean of its divisors is an integer number (539703648).

Almost surely, 2^2158720441 is an apocalyptic number.

It is an amenable number.

2158720441 is a deficient number, since it is larger than the sum of its proper divisors (94151).

2158720441 is an equidigital number, since it uses as much as digits as its factorization.

2158720441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94150.

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 2158720441 is about 46462.0322521519. The cubic root of 2158720441 is about 1292.4055111647.

Adding to 2158720441 its reverse (1440278512), we get a palindrome (3598998953).

The spelling of 2158720441 in words is "two billion, one hundred fifty-eight million, seven hundred twenty thousand, four hundred forty-one".