20111099989 has 2 divisors, whose sum is σ = 20111099990. Its totient is φ = 20111099988.

The previous prime is 20111099951. The next prime is 20111100029. The reversal of 20111099989 is 98999011102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18984155089 + 1126944900 = 137783^2 + 33570^2 .

It is a cyclic number.

It is not a de Polignac number, because 20111099989 - 2²³ = 20102711381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20111099189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055549994 + 10055549995.

It is an arithmetic number, because the mean of its divisors is an integer number (10055549995).

Almost surely, 2^20111099989 is an apocalyptic number.

It is an amenable number.

20111099989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111099989 is an equidigital number, since it uses as much as digits as its factorization.

20111099989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 104976, while the sum is 49.

The spelling of 20111099989 in words is "twenty billion, one hundred eleven million, ninety-nine thousand, nine hundred eighty-nine".