212100122201221 has 8 divisors (see below), whose sum is σ = 212361543229824. Its totient is φ = 211838708661840.

The previous prime is 212100122201203. The next prime is 212100122201237. The reversal of 212100122201221 is 122102221001212.

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 212100122201221 - 2¹⁷ = 212100122070149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212100122211221) 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, 55901736 + ... + 59575198.

It is an arithmetic number, because the mean of its divisors is an integer number (26545192903728).

Almost surely, 2^{212100122201221} is an apocalyptic number.

It is an amenable number.

212100122201221 is a deficient number, since it is larger than the sum of its proper divisors (261421028603).

212100122201221 is an equidigital number, since it uses as much as digits as its factorization.

212100122201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3744611.

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

Adding to 212100122201221 its reverse (122102221001212), we get a palindrome (334202343202433).

The spelling of 212100122201221 in words is "two hundred twelve trillion, one hundred billion, one hundred twenty-two million, two hundred one thousand, two hundred twenty-one".