21814857727 has 4 divisors (see below), whose sum is σ = 23492923720. Its totient is φ = 20136791736.

The previous prime is 21814857721. The next prime is 21814857731. The reversal of 21814857727 is 72775841812.

It is a happy number.

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 21814857727 - 2³ = 21814857719 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 (21814857721) 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 3 ways as a sum of consecutive naturals, for example, 839032977 + ... + 839033002.

It is an arithmetic number, because the mean of its divisors is an integer number (5873230930).

Almost surely, 2^21814857727 is an apocalyptic number.

21814857727 is a deficient number, since it is larger than the sum of its proper divisors (1678065993).

21814857727 is a wasteful number, since it uses less digits than its factorization.

21814857727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1678065992.

The product of its digits is 1756160, while the sum is 52.

The spelling of 21814857727 in words is "twenty-one billion, eight hundred fourteen million, eight hundred fifty-seven thousand, seven hundred twenty-seven".