21103240339 has 16 divisors (see below), whose sum is σ = 22242558240. Its totient is φ = 19995690240.

The previous prime is 21103240337. The next prime is 21103240349. The reversal of 21103240339 is 93304230112.

It is a cyclic number.

It is not a de Polignac number, because 21103240339 - 2¹ = 21103240337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21103240337) 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, 841717 + ... + 866425.

It is an arithmetic number, because the mean of its divisors is an integer number (1390159890).

Almost surely, 2^21103240339 is an apocalyptic number.

21103240339 is a deficient number, since it is larger than the sum of its proper divisors (1139317901).

21103240339 is a wasteful number, since it uses less digits than its factorization.

21103240339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25350.

The product of its (nonzero) digits is 3888, while the sum is 28.

The spelling of 21103240339 in words is "twenty-one billion, one hundred three million, two hundred forty thousand, three hundred thirty-nine".