20111011021097 has 2 divisors, whose sum is σ = 20111011021098. Its totient is φ = 20111011021096.

The previous prime is 20111011021091. The next prime is 20111011021139. The reversal of 20111011021097 is 79012011011102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11184235472656 + 8926775548441 = 3344284^2 + 2987771^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20111011021097 is a prime.

It is not a weakly prime, because it can be changed into another prime (20111011021091) 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, 10055505510548 + 10055505510549.

It is an arithmetic number, because the mean of its divisors is an integer number (10055505510549).

Almost surely, 2^{20111011021097} is an apocalyptic number.

It is an amenable number.

20111011021097 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111011021097 is an equidigital number, since it uses as much as digits as its factorization.

20111011021097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 26.

Adding to 20111011021097 its reverse (79012011011102), we get a palindrome (99123022032199).

The spelling of 20111011021097 in words is "twenty trillion, one hundred eleven billion, eleven million, twenty-one thousand, ninety-seven".