101100021091 has 2 divisors, whose sum is σ = 101100021092. Its totient is φ = 101100021090.

The previous prime is 101100021049. The next prime is 101100021107. The reversal of 101100021091 is 190120001101.

It is an a-pointer prime, because the next prime (101100021107) can be obtained adding 101100021091 to its sum of digits (16).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 101100021091 - 2²¹ = 101097923939 is a prime.

It is not a weakly prime, because it can be changed into another prime (101100121091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50550010545 + 50550010546.

It is an arithmetic number, because the mean of its divisors is an integer number (50550010546).

Almost surely, 2^101100021091 is an apocalyptic number.

101100021091 is a deficient number, since it is larger than the sum of its proper divisors (1).

101100021091 is an equidigital number, since it uses as much as digits as its factorization.

101100021091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 16.

Adding to 101100021091 its reverse (190120001101), we get a palindrome (291220022192).

The spelling of 101100021091 in words is "one hundred one billion, one hundred million, twenty-one thousand, ninety-one".