221240242127 has 2 divisors, whose sum is σ = 221240242128. Its totient is φ = 221240242126.

The previous prime is 221240242121. The next prime is 221240242141. The reversal of 221240242127 is 721242042122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221240242127 - 2¹⁴ = 221240225743 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221240242127.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221240242121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110620121063 + 110620121064.

It is an arithmetic number, because the mean of its divisors is an integer number (110620121064).

Almost surely, 2^221240242127 is an apocalyptic number.

221240242127 is a deficient number, since it is larger than the sum of its proper divisors (1).

221240242127 is an equidigital number, since it uses as much as digits as its factorization.

221240242127 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7168, while the sum is 29.

Adding to 221240242127 its reverse (721242042122), we get a palindrome (942482284249).

The spelling of 221240242127 in words is "two hundred twenty-one billion, two hundred forty million, two hundred forty-two thousand, one hundred twenty-seven".