21880127 has 2 divisors, whose sum is σ = 21880128. Its totient is φ = 21880126.

The previous prime is 21880121. The next prime is 21880147. The reversal of 21880127 is 72108812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21880127 - 2⁶ = 21880063 is a prime.

It is a super-2 number, since 2×21880127² = 957479915072258, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21880127.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21880121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10940063 + 10940064.

It is an arithmetic number, because the mean of its divisors is an integer number (10940064).

Almost surely, 2^21880127 is an apocalyptic number.

21880127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21880127 is an equidigital number, since it uses as much as digits as its factorization.

21880127 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 21880127 is about 4677.6198007106. The cubic root of 21880127 is about 279.6940834067.

Adding to 21880127 its reverse (72108812), we get a palindrome (93988939).

The spelling of 21880127 in words is "twenty-one million, eight hundred eighty thousand, one hundred twenty-seven".