221211201077 has 2 divisors, whose sum is σ = 221211201078. Its totient is φ = 221211201076.

The previous prime is 221211201059. The next prime is 221211201131. The reversal of 221211201077 is 770102112122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126569446756 + 94641754321 = 355766^2 + 307639^2 .

It is a cyclic number.

It is not a de Polignac number, because 221211201077 - 2²⁴ = 221194423861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221211201377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605600538 + 110605600539.

It is an arithmetic number, because the mean of its divisors is an integer number (110605600539).

Almost surely, 2^221211201077 is an apocalyptic number.

It is an amenable number.

221211201077 is a deficient number, since it is larger than the sum of its proper divisors (1).

221211201077 is an equidigital number, since it uses as much as digits as its factorization.

221211201077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 784, while the sum is 26.

Adding to 221211201077 its reverse (770102112122), we get a palindrome (991313313199).

The spelling of 221211201077 in words is "two hundred twenty-one billion, two hundred eleven million, two hundred one thousand, seventy-seven".