21702285439 has 4 divisors (see below), whose sum is σ = 21719945160. Its totient is φ = 21684625720.

The previous prime is 21702285403. The next prime is 21702285461. The reversal of 21702285439 is 93458220712.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21702285439 - 2²⁷ = 21568067711 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21702285395 and 21702285404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21702685439) 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 3 ways as a sum of consecutive naturals, for example, 8828017 + ... + 8830474.

It is an arithmetic number, because the mean of its divisors is an integer number (5429986290).

Almost surely, 2^21702285439 is an apocalyptic number.

21702285439 is a deficient number, since it is larger than the sum of its proper divisors (17659721).

21702285439 is a wasteful number, since it uses less digits than its factorization.

21702285439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17659720.

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 21702285439 in words is "twenty-one billion, seven hundred two million, two hundred eighty-five thousand, four hundred thirty-nine".