10542440021 has 4 divisors (see below), whose sum is σ = 10576122252. Its totient is φ = 10508757792.

The previous prime is 10542439987. The next prime is 10542440047. The reversal of 10542440021 is 12004424501.

10542440021 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 an emirpimes, since its reverse is a distinct semiprime: 12004424501 = 173 ⋅69389737.

It can be written as a sum of positive squares in 2 ways, for example, as 1275489796 + 9266950225 = 35714^2 + 96265^2 .

It is a cyclic number.

It is not a de Polignac number, because 10542440021 - 2²² = 10538245717 is a prime.

It is a super-2 number, since 2×10542440021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10542442021) 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, 16840646 + ... + 16841271.

It is an arithmetic number, because the mean of its divisors is an integer number (2644030563).

Almost surely, 2^10542440021 is an apocalyptic number.

It is an amenable number.

10542440021 is a deficient number, since it is larger than the sum of its proper divisors (33682231).

10542440021 is an equidigital number, since it uses as much as digits as its factorization.

10542440021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33682230.

The product of its (nonzero) digits is 1280, while the sum is 23.

Adding to 10542440021 its reverse (12004424501), we get a palindrome (22546864522).

The spelling of 10542440021 in words is "ten billion, five hundred forty-two million, four hundred forty thousand, twenty-one".