21052127 has 2 divisors, whose sum is σ = 21052128. Its totient is φ = 21052126.

The previous prime is 21052121. The next prime is 21052159. The reversal of 21052127 is 72125012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21052127 - 2⁴ = 21052111 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is equal to p_1333073 and since 21052127 and 1333073 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 21052099 and 21052108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21052121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10526063 + 10526064.

It is an arithmetic number, because the mean of its divisors is an integer number (10526064).

Almost surely, 2^21052127 is an apocalyptic number.

21052127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21052127 is an equidigital number, since it uses as much as digits as its factorization.

21052127 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 21052127 is about 4588.2596918658. The cubic root of 21052127 is about 276.1205059087.

Adding to 21052127 its reverse (72125012), we get a palindrome (93177139).

The spelling of 21052127 in words is "twenty-one million, fifty-two thousand, one hundred twenty-seven".