20011021099 has 2 divisors, whose sum is σ = 20011021100. Its totient is φ = 20011021098.

The previous prime is 20011021087. The next prime is 20011021109. The reversal of 20011021099 is 99012011002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20011021099 - 2⁹ = 20011020587 is a prime.

It is not a weakly prime, because it can be changed into another prime (20011021049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005510549 + 10005510550.

It is an arithmetic number, because the mean of its divisors is an integer number (10005510550).

Almost surely, 2^20011021099 is an apocalyptic number.

20011021099 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011021099 is an equidigital number, since it uses as much as digits as its factorization.

20011021099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 25.

The spelling of 20011021099 in words is "twenty billion, eleven million, twenty-one thousand, ninety-nine".