21201127 has 2 divisors, whose sum is σ = 21201128. Its totient is φ = 21201126.

The previous prime is 21201121. The next prime is 21201133. The reversal of 21201127 is 72110212.

It is a balanced prime because it is at equal distance from previous prime (21201121) and next prime (21201133).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21201127 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21201127.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21201121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600563 + 10600564.

It is an arithmetic number, because the mean of its divisors is an integer number (10600564).

Almost surely, 2^21201127 is an apocalyptic number.

21201127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201127 is an equidigital number, since it uses as much as digits as its factorization.

21201127 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 21201127 is about 4604.4681560415. The cubic root of 21201127 is about 276.7704049615.

Adding to 21201127 its reverse (72110212), we get a palindrome (93311339).

The spelling of 21201127 in words is "twenty-one million, two hundred one thousand, one hundred twenty-seven".