21111110212 has 24 divisors (see below), whose sum is σ = 37197800640. Its totient is φ = 10483357920.

The previous prime is 21111110161. The next prime is 21111110231. The reversal of 21111110212 is 21201111112.

It is a happy number.

It is a super-3 number, since 3×21111110212³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21111110192 and 21111110201.

It is an unprimeable number.

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, 426489 + ... + 473407.

It is an arithmetic number, because the mean of its divisors is an integer number (1549908360).

Almost surely, 2^21111110212 is an apocalyptic number.

It is an amenable number.

21111110212 is a deficient number, since it is larger than the sum of its proper divisors (16086690428).

21111110212 is a wasteful number, since it uses less digits than its factorization.

21111110212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47691 (or 47689 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21111110212 its reverse (21201111112), we get a palindrome (42312221324).

The spelling of 21111110212 in words is "twenty-one billion, one hundred eleven million, one hundred ten thousand, two hundred twelve".