21111112219 has 4 divisors (see below), whose sum is σ = 21111409000. Its totient is φ = 21110815440.

The previous prime is 21111112207. The next prime is 21111112229. The reversal of 21111112219 is 91221111112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21111112219 is a prime.

It is a super-2 number, since 2×21111112219² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21111112219.

It is not an unprimeable number, because it can be changed into a prime (21111112229) 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, 28984 + ... + 207514.

It is an arithmetic number, because the mean of its divisors is an integer number (5277852250).

Almost surely, 2^21111112219 is an apocalyptic number.

21111112219 is a deficient number, since it is larger than the sum of its proper divisors (296781).

21111112219 is a wasteful number, since it uses less digits than its factorization.

21111112219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296780.

The product of its digits is 72, while the sum is 22.

The spelling of 21111112219 in words is "twenty-one billion, one hundred eleven million, one hundred twelve thousand, two hundred nineteen".