201210202011221 has 24 divisors (see below), whose sum is σ = 219151531180296. Its totient is φ = 184649889116160.

The previous prime is 201210202011199. The next prime is 201210202011349. The reversal of 201210202011221 is 122110202012102.

It can be written as a sum of positive squares in 12 ways, for example, as 135993497640625 + 65216704370596 = 11661625^2 + 8075686^2 .

It is not a de Polignac number, because 201210202011221 - 2²² = 201210197816917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201210202011221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201210202013221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19986851 + ... + 28317743.

It is an arithmetic number, because the mean of its divisors is an integer number (9131313799179).

Almost surely, 2^{201210202011221} is an apocalyptic number.

It is an amenable number.

201210202011221 is a deficient number, since it is larger than the sum of its proper divisors (17941329169075).

201210202011221 is a wasteful number, since it uses less digits than its factorization.

201210202011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8331753 (or 8331740 counting only the distinct ones).

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

Adding to 201210202011221 its reverse (122110202012102), we get a palindrome (323320404023323).

The spelling of 201210202011221 in words is "two hundred one trillion, two hundred ten billion, two hundred two million, eleven thousand, two hundred twenty-one".