212122022221 has 16 divisors (see below), whose sum is σ = 236770292160. Its totient is φ = 188857094400.

The previous prime is 212122022213. The next prime is 212122022293. The reversal of 212122022221 is 122220221212.

212122022221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 212122022221 - 2³ = 212122022213 is a prime.

It is a super-2 number, since 2×212122022221² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212122022201) 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, 266355 + ... + 703696.

It is an arithmetic number, because the mean of its divisors is an integer number (14798143260).

Almost surely, 2^212122022221 is an apocalyptic number.

It is an amenable number.

212122022221 is a deficient number, since it is larger than the sum of its proper divisors (24648269939).

212122022221 is a wasteful number, since it uses less digits than its factorization.

212122022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970764.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 212122022221 its reverse (122220221212), we get a palindrome (334342243433).

The spelling of 212122022221 in words is "two hundred twelve billion, one hundred twenty-two million, twenty-two thousand, two hundred twenty-one".