21212121119 has 12 divisors (see below), whose sum is σ = 24689219400. Its totient is φ = 18171579888.

The previous prime is 21212121109. The next prime is 21212121157. The reversal of 21212121119 is 91112121212.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-21212121119 is a prime.

It is a super-2 number, since 2×21212121119² (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 = 21212121094 and 21212121103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212121109) 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 11 ways as a sum of consecutive naturals, for example, 33329 + ... + 208650.

It is an arithmetic number, because the mean of its divisors is an integer number (2057434950).

Almost surely, 2^21212121119 is an apocalyptic number.

21212121119 is a deficient number, since it is larger than the sum of its proper divisors (3477098281).

21212121119 is a wasteful number, since it uses less digits than its factorization.

21212121119 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243782 (or 243775 counting only the distinct ones).

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

The spelling of 21212121119 in words is "twenty-one billion, two hundred twelve million, one hundred twenty-one thousand, one hundred nineteen".