21212000120221 has 8 divisors (see below), whose sum is σ = 22328463568320. Its totient is φ = 20095540911072.

The previous prime is 21212000120177. The next prime is 21212000120243. The reversal of 21212000120221 is 12202100021212.

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 21212000120221 - 2¹⁷ = 21211999989149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21212000120195 and 21212000120204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212000120281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18020496 + ... + 19161478.

It is an arithmetic number, because the mean of its divisors is an integer number (2791057946040).

Almost surely, 2^{21212000120221} is an apocalyptic number.

It is an amenable number.

21212000120221 is a deficient number, since it is larger than the sum of its proper divisors (1116463448099).

21212000120221 is a wasteful number, since it uses less digits than its factorization.

21212000120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2119475.

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

Adding to 21212000120221 its reverse (12202100021212), we get a palindrome (33414100141433).

Subtracting from 21212000120221 its reverse (12202100021212), we obtain a palindrome (9009900099009).

The spelling of 21212000120221 in words is "twenty-one trillion, two hundred twelve billion, one hundred twenty thousand, two hundred twenty-one".