102221111081 has 2 divisors, whose sum is σ = 102221111082. Its totient is φ = 102221111080.

The previous prime is 102221111053. The next prime is 102221111117. The reversal of 102221111081 is 180111122201.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83062122025 + 19158989056 = 288205^2 + 138416^2 .

It is a cyclic number.

It is not a de Polignac number, because 102221111081 - 2⁶ = 102221111017 is a prime.

It is a super-3 number, since 3×102221111081³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (102221111011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51110555540 + 51110555541.

It is an arithmetic number, because the mean of its divisors is an integer number (51110555541).

Almost surely, 2^102221111081 is an apocalyptic number.

It is an amenable number.

102221111081 is a deficient number, since it is larger than the sum of its proper divisors (1).

102221111081 is an equidigital number, since it uses as much as digits as its factorization.

102221111081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 102221111081 its reverse (180111122201), we get a palindrome (282332233282).

The spelling of 102221111081 in words is "one hundred two billion, two hundred twenty-one million, one hundred eleven thousand, eighty-one".