201211002101221 has 16 divisors (see below), whose sum is σ = 233929199903104. Its totient is φ = 169502943043584.

The previous prime is 201211002101201. The next prime is 201211002101269. The reversal of 201211002101221 is 122101200112102.

It is a cyclic number.

It is not a de Polignac number, because 201211002101221 - 2²⁵ = 201210968546789 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201211002101195 and 201211002101204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201211002101201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 695543196 + ... + 695832421.

It is an arithmetic number, because the mean of its divisors is an integer number (14620574993944).

Almost surely, 2^{201211002101221} is an apocalyptic number.

It is an amenable number.

201211002101221 is a deficient number, since it is larger than the sum of its proper divisors (32718197801883).

201211002101221 is a wasteful number, since it uses less digits than its factorization.

201211002101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1391375980.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 201211002101221 its reverse (122101200112102), we get a palindrome (323312202213323).

The spelling of 201211002101221 in words is "two hundred one trillion, two hundred eleven billion, two million, one hundred one thousand, two hundred twenty-one".