201312738221 has 6 divisors (see below), whose sum is σ = 234180124110. Its totient is φ = 172553775576.

The previous prime is 201312738161. The next prime is 201312738223. The reversal of 201312738221 is 122837213102.

It can be written as a sum of positive squares in only one way, i.e., 173093442025 + 28219296196 = 416045^2 + 167986^2 .

It is not a de Polignac number, because 201312738221 - 2²⁶ = 201245629357 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 (201312738223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2054211566 + ... + 2054211663.

It is an arithmetic number, because the mean of its divisors is an integer number (39030020685).

Almost surely, 2^201312738221 is an apocalyptic number.

It is an amenable number.

201312738221 is a deficient number, since it is larger than the sum of its proper divisors (32867385889).

201312738221 is an equidigital number, since it uses as much as digits as its factorization.

201312738221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4108423243 (or 4108423236 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The spelling of 201312738221 in words is "two hundred one billion, three hundred twelve million, seven hundred thirty-eight thousand, two hundred twenty-one".