21020330099 has 4 divisors (see below), whose sum is σ = 21083835960. Its totient is φ = 20956824240.

The previous prime is 21020330069. The next prime is 21020330117. The reversal of 21020330099 is 99003302012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21020330099 - 2¹⁶ = 21020264563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020330069) 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 in 3 ways as a sum of consecutive naturals, for example, 31752434 + ... + 31753095.

It is an arithmetic number, because the mean of its divisors is an integer number (5270958990).

Almost surely, 2^21020330099 is an apocalyptic number.

21020330099 is a deficient number, since it is larger than the sum of its proper divisors (63505861).

21020330099 is an equidigital number, since it uses as much as digits as its factorization.

21020330099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63505860.

The product of its (nonzero) digits is 2916, while the sum is 29.

The spelling of 21020330099 in words is "twenty-one billion, twenty million, three hundred thirty thousand, ninety-nine".