21342682809 has 24 divisors (see below), whose sum is σ = 36368896512. Its totient is φ = 11802404160.

The previous prime is 21342682807. The next prime is 21342682817. The reversal of 21342682809 is 90828624312.

21342682809 is a `hidden beast` number, since 21 + 342 + 6 + 8 + 280 + 9 = 666.

It is not a de Polignac number, because 21342682809 - 2¹ = 21342682807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21342682807) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5462124 + ... + 5466029.

It is an arithmetic number, because the mean of its divisors is an integer number (1515370688).

Almost surely, 2^21342682809 is an apocalyptic number.

It is an amenable number.

21342682809 is a deficient number, since it is larger than the sum of its proper divisors (15026213703).

21342682809 is a wasteful number, since it uses less digits than its factorization.

21342682809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10928197 (or 10928194 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The spelling of 21342682809 in words is "twenty-one billion, three hundred forty-two million, six hundred eighty-two thousand, eight hundred nine".