21858568703 has 4 divisors (see below), whose sum is σ = 23144366880. Its totient is φ = 20572770528.

The previous prime is 21858568691. The next prime is 21858568717. The reversal of 21858568703 is 30786585812.

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 21858568703 - 2⁴ = 21858568687 is a prime.

It is a super-2 number, since 2×21858568703² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21858568783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 642899063 + ... + 642899096.

It is an arithmetic number, because the mean of its divisors is an integer number (5786091720).

Almost surely, 2^21858568703 is an apocalyptic number.

21858568703 is a deficient number, since it is larger than the sum of its proper divisors (1285798177).

21858568703 is a wasteful number, since it uses less digits than its factorization.

21858568703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1285798176.

The product of its (nonzero) digits is 3225600, while the sum is 53.

The spelling of 21858568703 in words is "twenty-one billion, eight hundred fifty-eight million, five hundred sixty-eight thousand, seven hundred three".