2121540043 has 16 divisors (see below), whose sum is σ = 2444057280. Its totient is φ = 1803943296.

The previous prime is 2121540013. The next prime is 2121540061. The reversal of 2121540043 is 3400451212.

It is a cyclic number.

It is not a de Polignac number, because 2121540043 - 2²¹ = 2119442891 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121539996 and 2121540023.

It is not an unprimeable number, because it can be changed into a prime (2121540013) 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 15 ways as a sum of consecutive naturals, for example, 467421 + ... + 471937.

It is an arithmetic number, because the mean of its divisors is an integer number (152753580).

Almost surely, 2^2121540043 is an apocalyptic number.

2121540043 is a deficient number, since it is larger than the sum of its proper divisors (322517237).

2121540043 is a wasteful number, since it uses less digits than its factorization.

2121540043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5046.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 2121540043 is about 46060.1784950949. The cubic root of 2121540043 is about 1284.9426497138.

Adding to 2121540043 its reverse (3400451212), we get a palindrome (5521991255).

The spelling of 2121540043 in words is "two billion, one hundred twenty-one million, five hundred forty thousand, forty-three".