201013031221 has 2 divisors, whose sum is σ = 201013031222. Its totient is φ = 201013031220.

The previous prime is 201013031213. The next prime is 201013031231. The reversal of 201013031221 is 122130310102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 200999788900 + 13242321 = 448330^2 + 3639^2 .

It is a cyclic number.

It is not a de Polignac number, because 201013031221 - 2³ = 201013031213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201013031195 and 201013031204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201013031231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100506515610 + 100506515611.

It is an arithmetic number, because the mean of its divisors is an integer number (100506515611).

Almost surely, 2^201013031221 is an apocalyptic number.

It is an amenable number.

201013031221 is a deficient number, since it is larger than the sum of its proper divisors (1).

201013031221 is an equidigital number, since it uses as much as digits as its factorization.

201013031221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 201013031221 its reverse (122130310102), we get a palindrome (323143341323).

The spelling of 201013031221 in words is "two hundred one billion, thirteen million, thirty-one thousand, two hundred twenty-one".