21829127 has 2 divisors, whose sum is σ = 21829128. Its totient is φ = 21829126.

The previous prime is 21829121. The next prime is 21829147. The reversal of 21829127 is 72192812.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21829127 - 2¹² = 21825031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21829093 and 21829102.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21829121) 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, 10914563 + 10914564.

It is an arithmetic number, because the mean of its divisors is an integer number (10914564).

Almost surely, 2^21829127 is an apocalyptic number.

21829127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21829127 is an equidigital number, since it uses as much as digits as its factorization.

21829127 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 32.

The square root of 21829127 is about 4672.1651297873. The cubic root of 21829127 is about 279.4766030191.

The spelling of 21829127 in words is "twenty-one million, eight hundred twenty-nine thousand, one hundred twenty-seven".