21211211219 has 8 divisors (see below), whose sum is σ = 24500650608. Its totient is φ = 18148629760.

The previous prime is 21211211213. The next prime is 21211211227. The reversal of 21211211219 is 91211211212.

It is a happy number.

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 21211211219 - 2¹² = 21211207123 is a prime.

It is a super-2 number, since 2×21211211219² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21211211194 and 21211211203.

It is not an unprimeable number, because it can be changed into a prime (21211211213) 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, 56714282 + ... + 56714655.

It is an arithmetic number, because the mean of its divisors is an integer number (3062581326).

Almost surely, 2^21211211219 is an apocalyptic number.

21211211219 is a deficient number, since it is larger than the sum of its proper divisors (3289439389).

21211211219 is a wasteful number, since it uses less digits than its factorization.

21211211219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113428965.

The product of its digits is 144, while the sum is 23.

The spelling of 21211211219 in words is "twenty-one billion, two hundred eleven million, two hundred eleven thousand, two hundred nineteen".