221211009860077 has 2 divisors, whose sum is σ = 221211009860078. Its totient is φ = 221211009860076.

The previous prime is 221211009860017. The next prime is 221211009860171. The reversal of 221211009860077 is 770068900112122.

221211009860077 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 can be written as a sum of positive squares in only one way, i.e., 145290092605956 + 75920917254121 = 12053634^2 + 8713261^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221211009860077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221211009860017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605504930038 + 110605504930039.

It is an arithmetic number, because the mean of its divisors is an integer number (110605504930039).

Almost surely, 2^{221211009860077} is an apocalyptic number.

It is an amenable number.

221211009860077 is a deficient number, since it is larger than the sum of its proper divisors (1).

221211009860077 is an equidigital number, since it uses as much as digits as its factorization.

221211009860077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 46.

Adding to 221211009860077 its reverse (770068900112122), we get a palindrome (991279909972199).

The spelling of 221211009860077 in words is "two hundred twenty-one trillion, two hundred eleven billion, nine million, eight hundred sixty thousand, seventy-seven".