102211020091 has 2 divisors, whose sum is σ = 102211020092. Its totient is φ = 102211020090.

The previous prime is 102211020083. The next prime is 102211020157. The reversal of 102211020091 is 190020112201.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 102211020091 - 2³ = 102211020083 is a prime.

It is not a weakly prime, because it can be changed into another prime (102211027091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51105510045 + 51105510046.

It is an arithmetic number, because the mean of its divisors is an integer number (51105510046).

Almost surely, 2^102211020091 is an apocalyptic number.

102211020091 is a deficient number, since it is larger than the sum of its proper divisors (1).

102211020091 is an equidigital number, since it uses as much as digits as its factorization.

102211020091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 102211020091 its reverse (190020112201), we get a palindrome (292231132292).

The spelling of 102211020091 in words is "one hundred two billion, two hundred eleven million, twenty thousand, ninety-one".