212122020121 has 16 divisors (see below), whose sum is σ = 243857755008. Its totient is φ = 182627632000.

The previous prime is 212122020119. The next prime is 212122020179. The reversal of 212122020121 is 121020221212.

It is a happy number.

It is not a de Polignac number, because 212122020121 - 2¹ = 212122020119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212122020095 and 212122020104.

It is not an unprimeable number, because it can be changed into a prime (212122020101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4125076 + ... + 4176181.

It is an arithmetic number, because the mean of its divisors is an integer number (15241109688).

Almost surely, 2^212122020121 is an apocalyptic number.

It is an amenable number.

212122020121 is a deficient number, since it is larger than the sum of its proper divisors (31735734887).

212122020121 is a wasteful number, since it uses less digits than its factorization.

212122020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8301392.

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

Adding to 212122020121 its reverse (121020221212), we get a palindrome (333142241333).

The spelling of 212122020121 in words is "two hundred twelve billion, one hundred twenty-two million, twenty thousand, one hundred twenty-one".