212020001221 has 4 divisors (see below), whose sum is σ = 242308572832. Its totient is φ = 181731429612.

The previous prime is 212020001191. The next prime is 212020001231. The reversal of 212020001221 is 122100020212.

It is a happy number.

212020001221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212020001221 - 2¹¹ = 212019999173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212020001231) 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 3 ways as a sum of consecutive naturals, for example, 15144285795 + ... + 15144285808.

It is an arithmetic number, because the mean of its divisors is an integer number (60577143208).

Almost surely, 2^212020001221 is an apocalyptic number.

It is an amenable number.

212020001221 is a deficient number, since it is larger than the sum of its proper divisors (30288571611).

212020001221 is an equidigital number, since it uses as much as digits as its factorization.

212020001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30288571610.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 212020001221 its reverse (122100020212), we get a palindrome (334120021433).

The spelling of 212020001221 in words is "two hundred twelve billion, twenty million, one thousand, two hundred twenty-one".