21112743539 has 8 divisors (see below), whose sum is σ = 21240941040. Its totient is φ = 20984758816.

The previous prime is 21112743497. The next prime is 21112743541. The reversal of 21112743539 is 93534721112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21112743539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112743569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148157 + ... + 253329.

It is an arithmetic number, because the mean of its divisors is an integer number (2655117630).

Almost surely, 2^21112743539 is an apocalyptic number.

21112743539 is a deficient number, since it is larger than the sum of its proper divisors (128197501).

21112743539 is a wasteful number, since it uses less digits than its factorization.

21112743539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106389.

The product of its digits is 45360, while the sum is 38.

The spelling of 21112743539 in words is "twenty-one billion, one hundred twelve million, seven hundred forty-three thousand, five hundred thirty-nine".