212222002221 has 24 divisors (see below), whose sum is σ = 309842278200. Its totient is φ = 139959853056.

The previous prime is 212222002207. The next prime is 212222002241. The reversal of 212222002221 is 122200222212.

212222002221 is a `hidden beast` number, since 21 + 222 + 200 + 2 + 221 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 70609775625 + 141612226596 = 265725^2 + 376314^2 .

It is not a de Polignac number, because 212222002221 - 2⁵ = 212222002189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212222002194 and 212222002203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212222002241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1930855 + ... + 2037803.

It is an arithmetic number, because the mean of its divisors is an integer number (12910094925).

Almost surely, 2^212222002221 is an apocalyptic number.

It is an amenable number.

212222002221 is a deficient number, since it is larger than the sum of its proper divisors (97620275979).

212222002221 is a wasteful number, since it uses less digits than its factorization.

212222002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109325 (or 109322 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 212222002221 its reverse (122200222212), we get a palindrome (334422224433).

The spelling of 212222002221 in words is "two hundred twelve billion, two hundred twenty-two million, two thousand, two hundred twenty-one".