212210221000021 has 16 divisors (see below), whose sum is σ = 226844545737600. Its totient is φ = 198026846772480.

The previous prime is 212210220999983. The next prime is 212210221000033. The reversal of 212210221000021 is 120000122012212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 212210221000021 - 2¹³ = 212210220991829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212210220999959 and 212210221000004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212210221000051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27760606 + ... + 34569808.

It is an arithmetic number, because the mean of its divisors is an integer number (14177784108600).

Almost surely, 2^{212210221000021} is an apocalyptic number.

It is an amenable number.

212210221000021 is a deficient number, since it is larger than the sum of its proper divisors (14634324737579).

212210221000021 is a wasteful number, since it uses less digits than its factorization.

212210221000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6842316.

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

Adding to 212210221000021 its reverse (120000122012212), we get a palindrome (332210343012233).

The spelling of 212210221000021 in words is "two hundred twelve trillion, two hundred ten billion, two hundred twenty-one million, twenty-one", and thus it is an aban number.