212012220121 has 16 divisors (see below), whose sum is σ = 235064057536. Its totient is φ = 189979546176.

The previous prime is 212012220113. The next prime is 212012220149. The reversal of 212012220121 is 121022210212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 212012220121 - 2³ = 212012220113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212012220095 and 212012220104.

It is not an unprimeable number, because it can be changed into a prime (212012220151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1072290 + ... + 1254523.

It is an arithmetic number, because the mean of its divisors is an integer number (14691503596).

Almost surely, 2^212012220121 is an apocalyptic number.

It is an amenable number.

212012220121 is a deficient number, since it is larger than the sum of its proper divisors (23051837415).

212012220121 is a wasteful number, since it uses less digits than its factorization.

212012220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2327032.

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

Adding to 212012220121 its reverse (121022210212), we get a palindrome (333034430333).

Subtracting from 212012220121 its reverse (121022210212), we obtain a palindrome (90990009909).

The spelling of 212012220121 in words is "two hundred twelve billion, twelve million, two hundred twenty thousand, one hundred twenty-one".