201211001221 has 8 divisors (see below), whose sum is σ = 203923596800. Its totient is φ = 198502546320.

The previous prime is 201211001197. The next prime is 201211001249. The reversal of 201211001221 is 122100112102.

201211001221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 201211001221 - 2⁷ = 201211001093 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 (201211001261) 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 7 ways as a sum of consecutive naturals, for example, 937266 + ... + 1131763.

It is an arithmetic number, because the mean of its divisors is an integer number (25490449600).

Almost surely, 2^201211001221 is an apocalyptic number.

It is an amenable number.

201211001221 is a deficient number, since it is larger than the sum of its proper divisors (2712595579).

201211001221 is a wasteful number, since it uses less digits than its factorization.

201211001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2070339.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 201211001221 its reverse (122100112102), we get a palindrome (323311113323).

The spelling of 201211001221 in words is "two hundred one billion, two hundred eleven million, one thousand, two hundred twenty-one".