21212111000012 has 12 divisors (see below), whose sum is σ = 37388253202440. Its totient is φ = 10529752942176.

The previous prime is 21212111000009. The next prime is 21212111000023. The reversal of 21212111000012 is 21000011121212.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19075638833 + ... + 19075639944.

It is an arithmetic number, because the mean of its divisors is an integer number (3115687766870).

Almost surely, 2^{21212111000012} is an apocalyptic number.

It is an amenable number.

21212111000012 is a deficient number, since it is larger than the sum of its proper divisors (16176142202428).

21212111000012 is a wasteful number, since it uses less digits than its factorization.

21212111000012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38151278920 (or 38151278918 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21212111000012 its reverse (21000011121212), we get a palindrome (42212122121224).

The spelling of 21212111000012 in words is "twenty-one trillion, two hundred twelve billion, one hundred eleven million, twelve", and thus it is an aban number.