2113440021 has 72 divisors (see below), whose sum is σ = 3895976448. Its totient is φ = 1091664000.

The previous prime is 2113440011. The next prime is 2113440041. The reversal of 2113440021 is 1200443112.

2113440021 is a `hidden beast` number, since 211 + 34 + 400 + 21 = 666.

It is not a de Polignac number, because 2113440021 - 2⁹ = 2113439509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2113439976 and 2113440003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2113440001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 925401 + ... + 927681.

It is an arithmetic number, because the mean of its divisors is an integer number (54110784).

Almost surely, 2^2113440021 is an apocalyptic number.

2113440021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2113440021 is a deficient number, since it is larger than the sum of its proper divisors (1782536427).

2113440021 is a wasteful number, since it uses less digits than its factorization.

2113440021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2503 (or 2493 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 2113440021 is about 45972.1657201398. The cubic root of 2113440021 is about 1283.3052640325.

Adding to 2113440021 its reverse (1200443112), we get a palindrome (3313883133).

The spelling of 2113440021 in words is "two billion, one hundred thirteen million, four hundred forty thousand, twenty-one".