21688625603 has 8 divisors (see below), whose sum is σ = 22106417616. Its totient is φ = 21271151200.

The previous prime is 21688625549. The next prime is 21688625611. The reversal of 21688625603 is 30652688612.

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 21688625603 - 2²⁰ = 21687577027 is a prime.

It is a super-2 number, since 2×21688625603² (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 (21688625633) 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, 60848 + ... + 216978.

It is an arithmetic number, because the mean of its divisors is an integer number (2763302202).

Almost surely, 2^21688625603 is an apocalyptic number.

21688625603 is a deficient number, since it is larger than the sum of its proper divisors (417792013).

21688625603 is a wasteful number, since it uses less digits than its factorization.

21688625603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158805.

The product of its (nonzero) digits is 829440, while the sum is 47.

The spelling of 21688625603 in words is "twenty-one billion, six hundred eighty-eight million, six hundred twenty-five thousand, six hundred three".