21052443113 has 16 divisors (see below), whose sum is σ = 23338620816. Its totient is φ = 18863953920.

The previous prime is 21052443109. The next prime is 21052443133. The reversal of 21052443113 is 31134425012.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 180284329 + 20872158784 = 13427^2 + 144472^2 .

It is a cyclic number.

It is not a de Polignac number, because 21052443113 - 2² = 21052443109 is a prime.

It is a super-2 number, since 2×21052443113² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21052443133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157733 + ... + 258813.

It is an arithmetic number, because the mean of its divisors is an integer number (1458663801).

Almost surely, 2^21052443113 is an apocalyptic number.

It is an amenable number.

21052443113 is a deficient number, since it is larger than the sum of its proper divisors (2286177703).

21052443113 is a wasteful number, since it uses less digits than its factorization.

21052443113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101564.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 21052443113 its reverse (31134425012), we get a palindrome (52186868125).

The spelling of 21052443113 in words is "twenty-one billion, fifty-two million, four hundred forty-three thousand, one hundred thirteen".