21113411043 has 16 divisors (see below), whose sum is σ = 28321937280. Its totient is φ = 13990321536.

The previous prime is 21113411023. The next prime is 21113411051. The reversal of 21113411043 is 34011431112.

It is not a de Polignac number, because 21113411043 - 2¹² = 21113406947 is a prime.

It is a super-2 number, since 2×21113411043² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21113411023) 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, 1289796 + ... + 1306062.

It is an arithmetic number, because the mean of its divisors is an integer number (1770121080).

Almost surely, 2^21113411043 is an apocalyptic number.

21113411043 is a deficient number, since it is larger than the sum of its proper divisors (7208526237).

21113411043 is a wasteful number, since it uses less digits than its factorization.

21113411043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18866.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21113411043 its reverse (34011431112), we get a palindrome (55124842155).

The spelling of 21113411043 in words is "twenty-one billion, one hundred thirteen million, four hundred eleven thousand, forty-three".