102111202261 has 2 divisors, whose sum is σ = 102111202262. Its totient is φ = 102111202260.

The previous prime is 102111202213. The next prime is 102111202283. The reversal of 102111202261 is 162202111201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72620009361 + 29491192900 = 269481^2 + 171730^2 .

It is a cyclic number.

It is not a de Polignac number, because 102111202261 - 2⁷ = 102111202133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102111202961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51055601130 + 51055601131.

It is an arithmetic number, because the mean of its divisors is an integer number (51055601131).

Almost surely, 2^102111202261 is an apocalyptic number.

It is an amenable number.

102111202261 is a deficient number, since it is larger than the sum of its proper divisors (1).

102111202261 is an equidigital number, since it uses as much as digits as its factorization.

102111202261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 102111202261 its reverse (162202111201), we get a palindrome (264313313462).

The spelling of 102111202261 in words is "one hundred two billion, one hundred eleven million, two hundred two thousand, two hundred sixty-one".