21013127 has 2 divisors, whose sum is σ = 21013128. Its totient is φ = 21013126.

The previous prime is 21013117. The next prime is 21013159. The reversal of 21013127 is 72131012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21013127 - 2⁶ = 21013063 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21013117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506563 + 10506564.

It is an arithmetic number, because the mean of its divisors is an integer number (10506564).

Almost surely, 2^21013127 is an apocalyptic number.

21013127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21013127 is an equidigital number, since it uses as much as digits as its factorization.

21013127 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 21013127 is about 4584.0077443216. The cubic root of 21013127 is about 275.9498920096.

Adding to 21013127 its reverse (72131012), we get a palindrome (93144139).

The spelling of 21013127 in words is "twenty-one million, thirteen thousand, one hundred twenty-seven".