21607188607 has 16 divisors (see below), whose sum is σ = 22858027360. Its totient is φ = 20367925632.

The previous prime is 21607188593. The next prime is 21607188619. The reversal of 21607188607 is 70688170612.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21607188607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21607188677) 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, 4486933 + ... + 4491745.

It is an arithmetic number, because the mean of its divisors is an integer number (1428626710).

Almost surely, 2^21607188607 is an apocalyptic number.

21607188607 is a deficient number, since it is larger than the sum of its proper divisors (1250838753).

21607188607 is a wasteful number, since it uses less digits than its factorization.

21607188607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5962.

The product of its (nonzero) digits is 225792, while the sum is 46.

The spelling of 21607188607 in words is "twenty-one billion, six hundred seven million, one hundred eighty-eight thousand, six hundred seven".