201721368 has 32 divisors (see below), whose sum is σ = 515036160. Its totient is φ = 65809440.

The previous prime is 201721367. The next prime is 201721391. The reversal of 201721368 is 863127102.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201721367) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88288 + ... + 90543.

It is an arithmetic number, because the mean of its divisors is an integer number (16094880).

Almost surely, 2^201721368 is an apocalyptic number.

It is an amenable number.

201721368 is an abundant number, since it is smaller than the sum of its proper divisors (313314792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201721368 is a wasteful number, since it uses less digits than its factorization.

201721368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178887 (or 178883 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 201721368 is about 14202.8647814446. The cubic root of 201721368 is about 586.4765272826.

The spelling of 201721368 in words is "two hundred one million, seven hundred twenty-one thousand, three hundred sixty-eight".