221221127 has 2 divisors, whose sum is σ = 221221128. Its totient is φ = 221221126.

The previous prime is 221221097. The next prime is 221221213. The reversal of 221221127 is 721122122.

221221127 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221221127 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 221221099 and 221221108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221221327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610563 + 110610564.

It is an arithmetic number, because the mean of its divisors is an integer number (110610564).

Almost surely, 2^221221127 is an apocalyptic number.

221221127 is a deficient number, since it is larger than the sum of its proper divisors (1).

221221127 is an equidigital number, since it uses as much as digits as its factorization.

221221127 is an evil number, because the sum of its binary digits is even.

The product of its digits is 224, while the sum is 20.

The square root of 221221127 is about 14873.5041936996. The cubic root of 221221127 is about 604.7959396496.

Adding to 221221127 its reverse (721122122), we get a palindrome (942343249).

The spelling of 221221127 in words is "two hundred twenty-one million, two hundred twenty-one thousand, one hundred twenty-seven".