102110101981 has 2 divisors, whose sum is σ = 102110101982. Its totient is φ = 102110101980.

The previous prime is 102110101969. The next prime is 102110101993. The reversal of 102110101981 is 189101011201.

It is a balanced prime because it is at equal distance from previous prime (102110101969) and next prime (102110101993).

It can be written as a sum of positive squares in only one way, i.e., 77815892025 + 24294209956 = 278955^2 + 155866^2 .

It is an emirp because it is prime and its reverse (189101011201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102110101981 - 2⁵ = 102110101949 is a prime.

It is a super-2 number, since 2×102110101981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102110101381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51055050990 + 51055050991.

It is an arithmetic number, because the mean of its divisors is an integer number (51055050991).

Almost surely, 2^102110101981 is an apocalyptic number.

It is an amenable number.

102110101981 is a deficient number, since it is larger than the sum of its proper divisors (1).

102110101981 is an equidigital number, since it uses as much as digits as its factorization.

102110101981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 25.

The spelling of 102110101981 in words is "one hundred two billion, one hundred ten million, one hundred one thousand, nine hundred eighty-one".