21113111439 has 48 divisors (see below), whose sum is σ = 35808933888. Its totient is φ = 11736959616.

The previous prime is 21113111423. The next prime is 21113111443. The reversal of 21113111439 is 93411131112.

21113111439 is a `hidden beast` number, since 2 + 1 + 113 + 111 + 439 = 666.

It is not a de Polignac number, because 21113111439 - 2⁴ = 21113111423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113111479) 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 47 ways as a sum of consecutive naturals, for example, 473139 + ... + 515835.

It is an arithmetic number, because the mean of its divisors is an integer number (746019456).

Almost surely, 2^21113111439 is an apocalyptic number.

21113111439 is a deficient number, since it is larger than the sum of its proper divisors (14695822449).

21113111439 is a wasteful number, since it uses less digits than its factorization.

21113111439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42924 (or 42921 counting only the distinct ones).

The product of its digits is 648, while the sum is 27.

The spelling of 21113111439 in words is "twenty-one billion, one hundred thirteen million, one hundred eleven thousand, four hundred thirty-nine".