21869727 has 8 divisors (see below), whose sum is σ = 31810560. Its totient is φ = 13254360.

The previous prime is 21869719. The next prime is 21869747. The reversal of 21869727 is 72796812.

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

It is not a de Polignac number, because 21869727 - 2³ = 21869719 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21869747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 331327 + ... + 331392.

It is an arithmetic number, because the mean of its divisors is an integer number (3976320).

Almost surely, 2^21869727 is an apocalyptic number.

21869727 is a deficient number, since it is larger than the sum of its proper divisors (9940833).

21869727 is a wasteful number, since it uses less digits than its factorization.

21869727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662733.

The product of its digits is 84672, while the sum is 42.

The square root of 21869727 is about 4676.5079920813. The cubic root of 21869727 is about 279.6497619172.

The spelling of 21869727 in words is "twenty-one million, eight hundred sixty-nine thousand, seven hundred twenty-seven".