21212200000177 has 2 divisors, whose sum is σ = 21212200000178. Its totient is φ = 21212200000176.

The previous prime is 21212200000127. The next prime is 21212200000231. The reversal of 21212200000177 is 77100000221212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18201110908176 + 3011089092001 = 4266276^2 + 1735249^2 .

It is a cyclic number.

It is not a de Polignac number, because 21212200000177 - 2⁷ = 21212200000049 is a prime.

It is not a weakly prime, because it can be changed into another prime (21212200000127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606100000088 + 10606100000089.

It is an arithmetic number, because the mean of its divisors is an integer number (10606100000089).

Almost surely, 2^{21212200000177} is an apocalyptic number.

It is an amenable number.

21212200000177 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212200000177 is an equidigital number, since it uses as much as digits as its factorization.

21212200000177 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 784, while the sum is 25.

Adding to 21212200000177 its reverse (77100000221212), we get a palindrome (98312200221389).

The spelling of 21212200000177 in words is "twenty-one trillion, two hundred twelve billion, two hundred million, one hundred seventy-seven", and thus it is an aban number.