21003110043 has 4 divisors (see below), whose sum is σ = 28004146728. Its totient is φ = 14002073360.

The previous prime is 21003110027. The next prime is 21003110053. The reversal of 21003110043 is 34001130012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21003110043 - 2⁴ = 21003110027 is a prime.

It is a super-2 number, since 2×21003110043² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21003110053) 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 3 ways as a sum of consecutive naturals, for example, 3500518338 + ... + 3500518343.

It is an arithmetic number, because the mean of its divisors is an integer number (7001036682).

Almost surely, 2^21003110043 is an apocalyptic number.

21003110043 is a deficient number, since it is larger than the sum of its proper divisors (7001036685).

21003110043 is an equidigital number, since it uses as much as digits as its factorization.

21003110043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7001036684.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21003110043 its reverse (34001130012), we get a palindrome (55004240055).

The spelling of 21003110043 in words is "twenty-one billion, three million, one hundred ten thousand, forty-three".