21202127 has 2 divisors, whose sum is σ = 21202128. Its totient is φ = 21202126.

The previous prime is 21202121. The next prime is 21202133. The reversal of 21202127 is 72120212.

It is a balanced prime because it is at equal distance from previous prime (21202121) and next prime (21202133).

It is a cyclic number.

It is not a de Polignac number, because 21202127 - 2¹⁸ = 20939983 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 (21202121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601063 + 10601064.

It is an arithmetic number, because the mean of its divisors is an integer number (10601064).

Almost surely, 2^21202127 is an apocalyptic number.

21202127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202127 is an equidigital number, since it uses as much as digits as its factorization.

21202127 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 21202127 is about 4604.5767449354. The cubic root of 21202127 is about 276.7747563977.

Adding to 21202127 its reverse (72120212), we get a palindrome (93322339).

The spelling of 21202127 in words is "twenty-one million, two hundred two thousand, one hundred twenty-seven".