21875127 has 8 divisors (see below), whose sum is σ = 29207664. Its totient is φ = 14563008.

The previous prime is 21875123. The next prime is 21875129. The reversal of 21875127 is 72157812.

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

It is not a de Polignac number, because 21875127 - 2² = 21875123 is a prime.

It is a super-2 number, since 2×21875127² = 957042362532258, which contains 22 as substring.

It is a plaindrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21875123) 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, 2398 + ... + 7035.

It is an arithmetic number, because the mean of its divisors is an integer number (3650958).

Almost surely, 2^21875127 is an apocalyptic number.

21875127 is a deficient number, since it is larger than the sum of its proper divisors (7332537).

21875127 is an equidigital number, since it uses as much as digits as its factorization.

21875127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10209.

The product of its digits is 7840, while the sum is 33.

The square root of 21875127 is about 4677.0853103188. The cubic root of 21875127 is about 279.6727767517.

The spelling of 21875127 in words is "twenty-one million, eight hundred seventy-five thousand, one hundred twenty-seven".