21212221022000 has 40 divisors (see below), whose sum is σ = 51291150436032. Its totient is φ = 8484888408000.

The previous prime is 21212221021997. The next prime is 21212221022033. The reversal of 21212221022000 is 22012221212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 21212221022000.

It is an unprimeable number.

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, 5303053256 + ... + 5303057255.

Almost surely, 2^{21212221022000} is an apocalyptic number.

21212221022000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212221022000 is an abundant number, since it is smaller than the sum of its proper divisors (30078929414032).

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

21212221022000 is a wasteful number, since it uses less digits than its factorization.

21212221022000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10606110534 (or 10606110518 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21212221022000 its reverse (22012221212), we get a palindrome (21234233243212).

The spelling of 21212221022000 in words is "twenty-one trillion, two hundred twelve billion, two hundred twenty-one million, twenty-two thousand".