212220032121 has 12 divisors (see below), whose sum is σ = 307449665172. Its totient is φ = 141060197376.

The previous prime is 212220032093. The next prime is 212220032153. The reversal of 212220032121 is 121230022212.

212220032121 is a `hidden beast` number, since 2 + 122 + 200 + 321 + 21 = 666.

212220032121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 34084544400 + 178135487721 = 184620^2 + 422061^2 .

It is not a de Polignac number, because 212220032121 - 2⁹ = 212220031609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212220032094 and 212220032103.

It is not an unprimeable number, because it can be changed into a prime (212220032821) 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 11 ways as a sum of consecutive naturals, for example, 34982136 + ... + 34988201.

It is an arithmetic number, because the mean of its divisors is an integer number (25620805431).

Almost surely, 2^212220032121 is an apocalyptic number.

It is an amenable number.

212220032121 is a deficient number, since it is larger than the sum of its proper divisors (95229633051).

212220032121 is a wasteful number, since it uses less digits than its factorization.

212220032121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69970680 (or 69970677 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 212220032121 its reverse (121230022212), we get a palindrome (333450054333).

Subtracting from 212220032121 its reverse (121230022212), we obtain a palindrome (90990009909).

The spelling of 212220032121 in words is "two hundred twelve billion, two hundred twenty million, thirty-two thousand, one hundred twenty-one".