21212120200003 has 8 divisors (see below), whose sum is σ = 21608024842800. Its totient is φ = 20817428130048.

The previous prime is 21212120199971. The next prime is 21212120200049. The reversal of 21212120200003 is 30000202121212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21212120200003 - 2⁵ = 21212120199971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21212120200003.

It is not an unprimeable number, because it can be changed into a prime (21212120200903) 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, 303107898 + ... + 303177871.

It is an arithmetic number, because the mean of its divisors is an integer number (2701003105350).

Almost surely, 2^{21212120200003} is an apocalyptic number.

21212120200003 is a deficient number, since it is larger than the sum of its proper divisors (395904642797).

21212120200003 is an equidigital number, since it uses as much as digits as its factorization.

21212120200003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606286421.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21212120200003 its reverse (30000202121212), we get a palindrome (51212322321215).

The spelling of 21212120200003 in words is "twenty-one trillion, two hundred twelve billion, one hundred twenty million, two hundred thousand, three".