210111221000077 has 2 divisors, whose sum is σ = 210111221000078. Its totient is φ = 210111221000076.

The previous prime is 210111221000059. The next prime is 210111221000081. The reversal of 210111221000077 is 770000122111012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155671187034276 + 54440033965801 = 12476826^2 + 7378349^2 .

It is a cyclic number.

It is not a de Polignac number, because 210111221000077 - 2¹⁹ = 210111220475789 is a prime.

It is a super-5 number, since 5×210111221000077⁵ (a number of 73 digits) contains 55555 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210111221000677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105055610500038 + 105055610500039.

It is an arithmetic number, because the mean of its divisors is an integer number (105055610500039).

Almost surely, 2^{210111221000077} is an apocalyptic number.

It is an amenable number.

210111221000077 is a deficient number, since it is larger than the sum of its proper divisors (1).

210111221000077 is an equidigital number, since it uses as much as digits as its factorization.

210111221000077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 392, while the sum is 25.

Adding to 210111221000077 its reverse (770000122111012), we get a palindrome (980111343111089).

The spelling of 210111221000077 in words is "two hundred ten trillion, one hundred eleven billion, two hundred twenty-one million, seventy-seven", and thus it is an aban number.