21212001200012 has 48 divisors (see below), whose sum is σ = 43786979685120. Its totient is φ = 8803390571712.

The previous prime is 21212001200003. The next prime is 21212001200057. The reversal of 21212001200012 is 21000210021212.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a self number, because there is not a number n which added to its sum of digits gives 21212001200012.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95711663 + ... + 95933030.

It is an arithmetic number, because the mean of its divisors is an integer number (912228743440).

Almost surely, 2^{21212001200012} is an apocalyptic number.

It is an amenable number.

21212001200012 is an abundant number, since it is smaller than the sum of its proper divisors (22574978485108).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21212001200012 is a wasteful number, since it uses less digits than its factorization.

21212001200012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191644830 (or 191644828 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21212001200012 its reverse (21000210021212), we get a palindrome (42212211221224).

The spelling of 21212001200012 in words is "twenty-one trillion, two hundred twelve billion, one million, two hundred thousand, twelve".