101212221091 has 2 divisors, whose sum is σ = 101212221092. Its totient is φ = 101212221090.

The previous prime is 101212221053. The next prime is 101212221167. The reversal of 101212221091 is 190122212101.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 101212221091 - 2⁹ = 101212220579 is a prime.

It is not a weakly prime, because it can be changed into another prime (101212221491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50606110545 + 50606110546.

It is an arithmetic number, because the mean of its divisors is an integer number (50606110546).

Almost surely, 2^101212221091 is an apocalyptic number.

101212221091 is a deficient number, since it is larger than the sum of its proper divisors (1).

101212221091 is an equidigital number, since it uses as much as digits as its factorization.

101212221091 is an evil number, because the sum of its binary digits is even.

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

Adding to 101212221091 its reverse (190122212101), we get a palindrome (291334433192).

The spelling of 101212221091 in words is "one hundred one billion, two hundred twelve million, two hundred twenty-one thousand, ninety-one".