201210211211221 has 24 divisors (see below), whose sum is σ = 209457312704640. Its totient is φ = 193199029610496.

The previous prime is 201210211211183. The next prime is 201210211211281. The reversal of 201210211211221 is 122112112012102.

It is a happy number.

It is not a de Polignac number, because 201210211211221 - 2¹⁵ = 201210211178453 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 (201210211211281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2038781845 + ... + 2038880533.

It is an arithmetic number, because the mean of its divisors is an integer number (8727388029360).

Almost surely, 2^{201210211211221} is an apocalyptic number.

It is an amenable number.

201210211211221 is a deficient number, since it is larger than the sum of its proper divisors (8247101493419).

201210211211221 is an equidigital number, since it uses as much as digits as its factorization.

201210211211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114285 (or 114232 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 201210211211221 its reverse (122112112012102), we get a palindrome (323322323223323).

The spelling of 201210211211221 in words is "two hundred one trillion, two hundred ten billion, two hundred eleven million, two hundred eleven thousand, two hundred twenty-one".