212133212221 has 12 divisors (see below), whose sum is σ = 247061374560. Its totient is φ = 181611711960.

The previous prime is 212133212209. The next prime is 212133212293. The reversal of 212133212221 is 122212331212.

It is not a de Polignac number, because 212133212221 - 2²¹ = 212131115069 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212133212192 and 212133212201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212133212321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2538895 + ... + 2621116.

It is an arithmetic number, because the mean of its divisors is an integer number (20588447880).

Almost surely, 2^212133212221 is an apocalyptic number.

It is an amenable number.

212133212221 is a deficient number, since it is larger than the sum of its proper divisors (34928162339).

212133212221 is an equidigital number, since it uses as much as digits as its factorization.

212133212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5160864 (or 5160857 counting only the distinct ones).

The product of its digits is 576, while the sum is 22.

Adding to 212133212221 its reverse (122212331212), we get a palindrome (334345543433).

The spelling of 212133212221 in words is "two hundred twelve billion, one hundred thirty-three million, two hundred twelve thousand, two hundred twenty-one".