21013120099 has 2 divisors, whose sum is σ = 21013120100. Its totient is φ = 21013120098.

The previous prime is 21013120087. The next prime is 21013120103. The reversal of 21013120099 is 99002131012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21013120099 - 2¹³ = 21013111907 is a prime.

It is not a weakly prime, because it can be changed into another prime (21013120049) 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, 10506560049 + 10506560050.

It is an arithmetic number, because the mean of its divisors is an integer number (10506560050).

Almost surely, 2^21013120099 is an apocalyptic number.

21013120099 is a deficient number, since it is larger than the sum of its proper divisors (1).

21013120099 is an equidigital number, since it uses as much as digits as its factorization.

21013120099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 28.

The spelling of 21013120099 in words is "twenty-one billion, thirteen million, one hundred twenty thousand, ninety-nine".