21447127 has 8 divisors (see below), whose sum is σ = 23164064. Its totient is φ = 19739808.

The previous prime is 21447119. The next prime is 21447137. The reversal of 21447127 is 72174412.

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

It is a cyclic number.

It is not a de Polignac number, because 21447127 - 2³ = 21447119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21447095 and 21447104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21447137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2638 + ... + 7060.

It is an arithmetic number, because the mean of its divisors is an integer number (2895508).

Almost surely, 2^21447127 is an apocalyptic number.

21447127 is a deficient number, since it is larger than the sum of its proper divisors (1716937).

21447127 is a wasteful number, since it uses less digits than its factorization.

21447127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4809.

The product of its digits is 3136, while the sum is 28.

The square root of 21447127 is about 4631.1042959536. The cubic root of 21447127 is about 277.8367612997.

The spelling of 21447127 in words is "twenty-one million, four hundred forty-seven thousand, one hundred twenty-seven".