212202022221 has 48 divisors (see below), whose sum is σ = 361297617408. Its totient is φ = 117503136000.

The previous prime is 212202022159. The next prime is 212202022223. The reversal of 212202022221 is 122220202212.

212202022221 is a `hidden beast` number, since 21 + 220 + 202 + 2 + 221 = 666.

212202022221 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 212202022221 - 2¹⁷ = 212201891149 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 212202022194 and 212202022203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212202022223) 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 47 ways as a sum of consecutive naturals, for example, 55720 + ... + 653841.

It is an arithmetic number, because the mean of its divisors is an integer number (7527033696).

Almost surely, 2^212202022221 is an apocalyptic number.

212202022221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

212202022221 is a deficient number, since it is larger than the sum of its proper divisors (149095595187).

212202022221 is a wasteful number, since it uses less digits than its factorization.

212202022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 709722 (or 709719 counting only the distinct ones).

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

Adding to 212202022221 its reverse (122220202212), we get a palindrome (334422224433).

The spelling of 212202022221 in words is "two hundred twelve billion, two hundred two million, twenty-two thousand, two hundred twenty-one".