21331003099 has 16 divisors (see below), whose sum is σ = 25236169920. Its totient is φ = 17641169280.

The previous prime is 21331003081. The next prime is 21331003123. The reversal of 21331003099 is 99030013312.

It is not a de Polignac number, because 21331003099 - 2³¹ = 19183519451 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21331003099.

It is not an unprimeable number, because it can be changed into a prime (21331003399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 267889 + ... + 338269.

It is an arithmetic number, because the mean of its divisors is an integer number (1577260620).

Almost surely, 2^21331003099 is an apocalyptic number.

21331003099 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

21331003099 is a deficient number, since it is larger than the sum of its proper divisors (3905166821).

21331003099 is a wasteful number, since it uses less digits than its factorization.

21331003099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71910.

The product of its (nonzero) digits is 4374, while the sum is 31.

The spelling of 21331003099 in words is "twenty-one billion, three hundred thirty-one million, three thousand, ninety-nine".