21331127 has 2 divisors, whose sum is σ = 21331128. Its totient is φ = 21331126.

The previous prime is 21331109. The next prime is 21331133. The reversal of 21331127 is 72113312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21331127 - 2¹⁴ = 21314743 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21331099 and 21331108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21331147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665563 + 10665564.

It is an arithmetic number, because the mean of its divisors is an integer number (10665564).

Almost surely, 2^21331127 is an apocalyptic number.

21331127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21331127 is an equidigital number, since it uses as much as digits as its factorization.

21331127 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 252, while the sum is 20.

The square root of 21331127 is about 4618.5633047518. The cubic root of 21331127 is about 277.3349482476.

Adding to 21331127 its reverse (72113312), we get a palindrome (93444439).

The spelling of 21331127 in words is "twenty-one million, three hundred thirty-one thousand, one hundred twenty-seven".