21113031443 has 8 divisors (see below), whose sum is σ = 24961219680. Its totient is φ = 17472853440.

The previous prime is 21113031431. The next prime is 21113031473. The reversal of 21113031443 is 34413031112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21113031443 - 2¹² = 21113027347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21113031403) 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 7 ways as a sum of consecutive naturals, for example, 52002338 + ... + 52002743.

It is an arithmetic number, because the mean of its divisors is an integer number (3120152460).

Almost surely, 2^21113031443 is an apocalyptic number.

21113031443 is a deficient number, since it is larger than the sum of its proper divisors (3848188237).

21113031443 is a wasteful number, since it uses less digits than its factorization.

21113031443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104005117.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21113031443 its reverse (34413031112), we get a palindrome (55526062555).

The spelling of 21113031443 in words is "twenty-one billion, one hundred thirteen million, thirty-one thousand, four hundred forty-three".