20011120091 has 2 divisors, whose sum is σ = 20011120092. Its totient is φ = 20011120090.

The previous prime is 20011120061. The next prime is 20011120159. The reversal of 20011120091 is 19002111002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20011120091 - 2²² = 20006925787 is a prime.

It is not a weakly prime, because it can be changed into another prime (20011120021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005560045 + 10005560046.

It is an arithmetic number, because the mean of its divisors is an integer number (10005560046).

Almost surely, 2^20011120091 is an apocalyptic number.

20011120091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011120091 is an equidigital number, since it uses as much as digits as its factorization.

20011120091 is an evil number, because the sum of its binary digits is even.

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

Adding to 20011120091 its reverse (19002111002), we get a palindrome (39013231093).

The spelling of 20011120091 in words is "twenty billion, eleven million, one hundred twenty thousand, ninety-one".