216921127 has 2 divisors, whose sum is σ = 216921128. Its totient is φ = 216921126.

The previous prime is 216921113. The next prime is 216921149. The reversal of 216921127 is 721129612.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216921127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216922127) 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, 108460563 + 108460564.

It is an arithmetic number, because the mean of its divisors is an integer number (108460564).

Almost surely, 2^216921127 is an apocalyptic number.

216921127 is a deficient number, since it is larger than the sum of its proper divisors (1).

216921127 is an equidigital number, since it uses as much as digits as its factorization.

216921127 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 31.

The square root of 216921127 is about 14728.2424952878. The cubic root of 216921127 is about 600.8516858504.

The spelling of 216921127 in words is "two hundred sixteen million, nine hundred twenty-one thousand, one hundred twenty-seven".