212221011 has 12 divisors (see below), whose sum is σ = 290821272. Its totient is φ = 137654208.

The previous prime is 212221007. The next prime is 212221019. The reversal of 212221011 is 110122212.

212221011 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 212221011 - 2² = 212221007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212221019) 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, 21730 + ... + 29943.

It is an arithmetic number, because the mean of its divisors is an integer number (24235106).

Almost surely, 2^212221011 is an apocalyptic number.

212221011 is a deficient number, since it is larger than the sum of its proper divisors (78600261).

212221011 is an equidigital number, since it uses as much as digits as its factorization.

212221011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51750 (or 51713 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 212221011 is about 14567.8073504560. The cubic root of 212221011 is about 596.4803296847.

Adding to 212221011 its reverse (110122212), we get a palindrome (322343223).

The spelling of 212221011 in words is "two hundred twelve million, two hundred twenty-one thousand, eleven".