21121212211219 has 4 divisors (see below), whose sum is σ = 21125806780144. Its totient is φ = 21116617642296.

The previous prime is 21121212211213. The next prime is 21121212211247. The reversal of 21121212211219 is 91211221212112.

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 21121212211219 - 2¹⁷ = 21121212080147 is a prime.

It is a super-2 number, since 2×21121212211219² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121212211213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2297277567 + ... + 2297286760.

It is an arithmetic number, because the mean of its divisors is an integer number (5281451695036).

Almost surely, 2^{21121212211219} is an apocalyptic number.

21121212211219 is a deficient number, since it is larger than the sum of its proper divisors (4594568925).

21121212211219 is an equidigital number, since it uses as much as digits as its factorization.

21121212211219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4594568924.

The product of its digits is 576, while the sum is 28.

The spelling of 21121212211219 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twelve million, two hundred eleven thousand, two hundred nineteen".