21675127 has 4 divisors (see below), whose sum is σ = 21692880. Its totient is φ = 21657376.

The previous prime is 21675113. The next prime is 21675133. The reversal of 21675127 is 72157612.

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 21675127 - 2⁷ = 21674999 is a prime.

It is a super-2 number, since 2×21675127² = 939622260932258, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21675167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6898 + ... + 9535.

It is an arithmetic number, because the mean of its divisors is an integer number (5423220).

Almost surely, 2^21675127 is an apocalyptic number.

21675127 is a deficient number, since it is larger than the sum of its proper divisors (17753).

21675127 is a wasteful number, since it uses less digits than its factorization.

21675127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17752.

The product of its digits is 5880, while the sum is 31.

The square root of 21675127 is about 4655.6553781396. The cubic root of 21675127 is about 278.8178347781.

The spelling of 21675127 in words is "twenty-one million, six hundred seventy-five thousand, one hundred twenty-seven".