210221111099977 has 2 divisors, whose sum is σ = 210221111099978. Its totient is φ = 210221111099976.

The previous prime is 210221111099947. The next prime is 210221111100029. The reversal of 210221111099977 is 779990111122012.

It is an a-pointer prime, because the next prime (210221111100029) can be obtained adding 210221111099977 to its sum of digits (52).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 200385994162176 + 9835116937801 = 14155776^2 + 3136099^2 .

It is a cyclic number.

It is not a de Polignac number, because 210221111099977 - 2¹¹ = 210221111097929 is a prime.

It is not a weakly prime, because it can be changed into another prime (210221111099927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105110555549988 + 105110555549989.

It is an arithmetic number, because the mean of its divisors is an integer number (105110555549989).

Almost surely, 2^{210221111099977} is an apocalyptic number.

It is an amenable number.

210221111099977 is a deficient number, since it is larger than the sum of its proper divisors (1).

210221111099977 is an equidigital number, since it uses as much as digits as its factorization.

210221111099977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 285768, while the sum is 52.

The spelling of 210221111099977 in words is "two hundred ten trillion, two hundred twenty-one billion, one hundred eleven million, ninety-nine thousand, nine hundred seventy-seven".