21812003399 has 8 divisors (see below), whose sum is σ = 22323718032. Its totient is φ = 21300491520.

The previous prime is 21812003387. The next prime is 21812003417. The reversal of 21812003399 is 99330021812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21812003399 - 2⁴ = 21812003383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21812003309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179057 + ... + 275109.

It is an arithmetic number, because the mean of its divisors is an integer number (2790464754).

Almost surely, 2^21812003399 is an apocalyptic number.

21812003399 is a deficient number, since it is larger than the sum of its proper divisors (511714633).

21812003399 is an equidigital number, since it uses as much as digits as its factorization.

21812003399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101377.

The product of its (nonzero) digits is 23328, while the sum is 38.

The spelling of 21812003399 in words is "twenty-one billion, eight hundred twelve million, three thousand, three hundred ninety-nine".