21601127 has 4 divisors (see below), whose sum is σ = 21670896. Its totient is φ = 21531360.

The previous prime is 21601121. The next prime is 21601171. The reversal of 21601127 is 72110612.

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 21601127 - 2¹² = 21597031 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21601099 and 21601108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21601121) 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, 34418 + ... + 35039.

It is an arithmetic number, because the mean of its divisors is an integer number (5417724).

Almost surely, 2^21601127 is an apocalyptic number.

21601127 is a deficient number, since it is larger than the sum of its proper divisors (69769).

21601127 is an equidigital number, since it uses as much as digits as its factorization.

21601127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69768.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 21601127 is about 4647.7012597627. The cubic root of 21601127 is about 278.5001735164.

Adding to 21601127 its reverse (72110612), we get a palindrome (93711739).

The spelling of 21601127 in words is "twenty-one million, six hundred one thousand, one hundred twenty-seven".