102021212191 has 2 divisors, whose sum is σ = 102021212192. Its totient is φ = 102021212190.

The previous prime is 102021212077. The next prime is 102021212221. The reversal of 102021212191 is 191212120201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 102021212191 - 2¹⁵ = 102021179423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102021216191) 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, 51010606095 + 51010606096.

It is an arithmetic number, because the mean of its divisors is an integer number (51010606096).

Almost surely, 2^102021212191 is an apocalyptic number.

102021212191 is a deficient number, since it is larger than the sum of its proper divisors (1).

102021212191 is an equidigital number, since it uses as much as digits as its factorization.

102021212191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 22.

Adding to 102021212191 its reverse (191212120201), we get a palindrome (293233332392).

The spelling of 102021212191 in words is "one hundred two billion, twenty-one million, two hundred twelve thousand, one hundred ninety-one".