21112861219 has 4 divisors (see below), whose sum is σ = 21458973760. Its totient is φ = 20766748680.

The previous prime is 21112861207. The next prime is 21112861249. The reversal of 21112861219 is 91216821112.

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 21112861219 - 2⁹ = 21112860707 is a prime.

It is a super-3 number, since 3×21112861219³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112861249) 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, 173056179 + ... + 173056300.

It is an arithmetic number, because the mean of its divisors is an integer number (5364743440).

Almost surely, 2^21112861219 is an apocalyptic number.

21112861219 is a deficient number, since it is larger than the sum of its proper divisors (346112541).

21112861219 is an equidigital number, since it uses as much as digits as its factorization.

21112861219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346112540.

The product of its digits is 3456, while the sum is 34.

The spelling of 21112861219 in words is "twenty-one billion, one hundred twelve million, eight hundred sixty-one thousand, two hundred nineteen".