21709839067 has 8 divisors (see below), whose sum is σ = 24854249696. Its totient is φ = 18576179712.

The previous prime is 21709839017. The next prime is 21709839077. The reversal of 21709839067 is 76093890712.

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

It is a cyclic number.

It is not a de Polignac number, because 21709839067 - 2¹⁹ = 21709314779 is a prime.

It is a super-2 number, since 2×21709839067² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21709839017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2683488 + ... + 2691565.

It is an arithmetic number, because the mean of its divisors is an integer number (3106781212).

Almost surely, 2^21709839067 is an apocalyptic number.

21709839067 is a deficient number, since it is larger than the sum of its proper divisors (3144410629).

21709839067 is an equidigital number, since it uses as much as digits as its factorization.

21709839067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5375637.

The product of its (nonzero) digits is 1143072, while the sum is 52.

The spelling of 21709839067 in words is "twenty-one billion, seven hundred nine million, eight hundred thirty-nine thousand, sixty-seven".