21703720019 has 8 divisors (see below), whose sum is σ = 22169878848. Its totient is φ = 21237743680.

The previous prime is 21703719997. The next prime is 21703720037. The reversal of 21703720019 is 91002730712.

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 21703720019 - 2¹² = 21703715923 is a prime.

It is a super-2 number, since 2×21703720019² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21703726019) 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 7 ways as a sum of consecutive naturals, for example, 209999 + ... + 295815.

It is an arithmetic number, because the mean of its divisors is an integer number (2771234856).

Almost surely, 2^21703720019 is an apocalyptic number.

21703720019 is a deficient number, since it is larger than the sum of its proper divisors (466158829).

21703720019 is an equidigital number, since it uses as much as digits as its factorization.

21703720019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91245.

The product of its (nonzero) digits is 5292, while the sum is 32.

The spelling of 21703720019 in words is "twenty-one billion, seven hundred three million, seven hundred twenty thousand, nineteen".