212101020012221 has 12 divisors (see below), whose sum is σ = 219972419456832. Its totient is φ = 204501637899000.

The previous prime is 212101020012209. The next prime is 212101020012281. The reversal of 212101020012221 is 122210020101212.

It is not a de Polignac number, because 212101020012221 - 2¹⁸ = 212101019750077 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212101020012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212101020012281) 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, 406951115 + ... + 407471976.

It is an arithmetic number, because the mean of its divisors is an integer number (18331034954736).

Almost surely, 2^{212101020012221} is an apocalyptic number.

It is an amenable number.

212101020012221 is a deficient number, since it is larger than the sum of its proper divisors (7871399444611).

212101020012221 is an equidigital number, since it uses as much as digits as its factorization.

212101020012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814423424 (or 814423393 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 212101020012221 its reverse (122210020101212), we get a palindrome (334311040113433).

The spelling of 212101020012221 in words is "two hundred twelve trillion, one hundred one billion, twenty million, twelve thousand, two hundred twenty-one".