21212201212000 has 48 divisors (see below), whose sum is σ = 52118378387712. Its totient is φ = 8484880483200.

The previous prime is 21212201211989. The next prime is 21212201212009. The reversal of 21212201212000 is 21210221212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212201212009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2651521152 + ... + 2651529151.

It is an arithmetic number, because the mean of its divisors is an integer number (1085799549744).

Almost surely, 2^{21212201212000} is an apocalyptic number.

21212201212000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212201212000 is an abundant number, since it is smaller than the sum of its proper divisors (30906177175712).

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

21212201212000 is an equidigital number, since it uses as much as digits as its factorization.

21212201212000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5303050328 (or 5303050310 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21212201212000 its reverse (21210221212), we get a palindrome (21233411433212).

The spelling of 21212201212000 in words is "twenty-one trillion, two hundred twelve billion, two hundred one million, two hundred twelve thousand".