102102011021 has 2 divisors, whose sum is σ = 102102011022. Its totient is φ = 102102011020.

The previous prime is 102102010957. The next prime is 102102011027. The reversal of 102102011021 is 120110201201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70137577225 + 31964433796 = 264835^2 + 178786^2 .

It is a cyclic number.

It is not a de Polignac number, because 102102011021 - 2⁶ = 102102010957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102102010993 and 102102011011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102102011027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51051005510 + 51051005511.

It is an arithmetic number, because the mean of its divisors is an integer number (51051005511).

Almost surely, 2^102102011021 is an apocalyptic number.

It is an amenable number.

102102011021 is a deficient number, since it is larger than the sum of its proper divisors (1).

102102011021 is an equidigital number, since it uses as much as digits as its factorization.

102102011021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 102102011021 its reverse (120110201201), we get a palindrome (222212212222).

The spelling of 102102011021 in words is "one hundred two billion, one hundred two million, eleven thousand, twenty-one".