212120002121221 has 8 divisors (see below), whose sum is σ = 223594761052800. Its totient is φ = 200676298019040.

The previous prime is 212120002121207. The next prime is 212120002121323. The reversal of 212120002121221 is 122121200021212.

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 212120002121221 - 2⁹ = 212120002120709 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212120002121821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7763693320 + ... + 7763720641.

It is an arithmetic number, because the mean of its divisors is an integer number (27949345131600).

Almost surely, 2^{212120002121221} is an apocalyptic number.

It is an amenable number.

212120002121221 is a deficient number, since it is larger than the sum of its proper divisors (11474758931579).

212120002121221 is a wasteful number, since it uses less digits than its factorization.

212120002121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15527414699.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 212120002121221 its reverse (122121200021212), we get a palindrome (334241202142433).

The spelling of 212120002121221 in words is "two hundred twelve trillion, one hundred twenty billion, two million, one hundred twenty-one thousand, two hundred twenty-one".