212100121201221 has 12 divisors (see below), whose sum is σ = 334218372802080. Its totient is φ = 128545528000680.

The previous prime is 212100121201211. The next prime is 212100121201279. The reversal of 212100121201221 is 122102121001212.

212100121201221 is a `hidden beast` number, since 2 + 121 + 0 + 0 + 121 + 201 + 221 = 666.

It is not a de Polignac number, because 212100121201221 - 2⁷ = 212100121201093 is a prime.

It is a super-2 number, since 2×212100121201221² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212100121201194 and 212100121201203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212100121201211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1071212733241 + ... + 1071212733438.

It is an arithmetic number, because the mean of its divisors is an integer number (27851531066840).

Almost surely, 2^{212100121201221} is an apocalyptic number.

It is an amenable number.

212100121201221 is a deficient number, since it is larger than the sum of its proper divisors (122118251600859).

212100121201221 is a wasteful number, since it uses less digits than its factorization.

212100121201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2142425466696 (or 2142425466693 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 212100121201221 its reverse (122102121001212), we get a palindrome (334202242202433).

The spelling of 212100121201221 in words is "two hundred twelve trillion, one hundred billion, one hundred twenty-one million, two hundred one thousand, two hundred twenty-one".