20201101091 has 2 divisors, whose sum is σ = 20201101092. Its totient is φ = 20201101090.

The previous prime is 20201101087. The next prime is 20201101117. The reversal of 20201101091 is 19010110202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20201101091 - 2² = 20201101087 is a prime.

It is a super-3 number, since 3×20201101091³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (20201100091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100550545 + 10100550546.

It is an arithmetic number, because the mean of its divisors is an integer number (10100550546).

Almost surely, 2^20201101091 is an apocalyptic number.

20201101091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201101091 is an equidigital number, since it uses as much as digits as its factorization.

20201101091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 20201101091 its reverse (19010110202), we get a palindrome (39211211293).

The spelling of 20201101091 in words is "twenty billion, two hundred one million, one hundred one thousand, ninety-one".