212221121201 has 4 divisors (see below), whose sum is σ = 212302967652. Its totient is φ = 212139274752.

The previous prime is 212221121191. The next prime is 212221121209. The reversal of 212221121201 is 102121122212.

212221121201 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.

It can be written as a sum of positive squares in 2 ways, for example, as 152490250000 + 59730871201 = 390500^2 + 244399^2 .

It is a cyclic number.

It is not a de Polignac number, because 212221121201 - 2¹⁸ = 212220859057 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 212221121201.

It is not an unprimeable number, because it can be changed into a prime (212221121209) 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, 40919336 + ... + 40924521.

It is an arithmetic number, because the mean of its divisors is an integer number (53075741913).

Almost surely, 2^212221121201 is an apocalyptic number.

It is an amenable number.

212221121201 is a deficient number, since it is larger than the sum of its proper divisors (81846451).

212221121201 is an equidigital number, since it uses as much as digits as its factorization.

212221121201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81846450.

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

Adding to 212221121201 its reverse (102121122212), we get a palindrome (314342243413).

It can be divided in two parts, 2122211 and 21201, that added together give a palindrome (2143412).

The spelling of 212221121201 in words is "two hundred twelve billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred one".