21347744135 has 16 divisors (see below), whose sum is σ = 27216798336. Its totient is φ = 16018718208.

The previous prime is 21347744083. The next prime is 21347744137. The reversal of 21347744135 is 53144774312.

It is a cyclic number.

It is not a de Polignac number, because 21347744135 - 2¹⁰ = 21347743111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21347744092 and 21347744101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21347744137) 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, 403679 + ... + 453488.

It is an arithmetic number, because the mean of its divisors is an integer number (1701049896).

Almost surely, 2^21347744135 is an apocalyptic number.

21347744135 is a deficient number, since it is larger than the sum of its proper divisors (5869054201).

21347744135 is a wasteful number, since it uses less digits than its factorization.

21347744135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857482.

The product of its digits is 282240, while the sum is 41.

The spelling of 21347744135 in words is "twenty-one billion, three hundred forty-seven million, seven hundred forty-four thousand, one hundred thirty-five".