212122020021 has 16 divisors (see below), whose sum is σ = 283584475584. Its totient is φ = 141037231104.

The previous prime is 212122020013. The next prime is 212122020101. The reversal of 212122020021 is 120020221212.

212122020021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 212122020021 - 2³ = 212122020013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212122024021) 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 15 ways as a sum of consecutive naturals, for example, 14400166 + ... + 14414888.

It is an arithmetic number, because the mean of its divisors is an integer number (17724029724).

Almost surely, 2^212122020021 is an apocalyptic number.

It is an amenable number.

212122020021 is a deficient number, since it is larger than the sum of its proper divisors (71462455563).

212122020021 is a wasteful number, since it uses less digits than its factorization.

212122020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27220.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 212122020021 its reverse (120020221212), we get a palindrome (332142241233).

The spelling of 212122020021 in words is "two hundred twelve billion, one hundred twenty-two million, twenty thousand, twenty-one".