201721160 has 32 divisors (see below), whose sum is σ = 454326840. Its totient is φ = 80607744.

The previous prime is 201721147. The next prime is 201721181. The reversal of 201721160 is 61127102.

It can be written as a sum of positive squares in 4 ways, for example, as 172712164 + 29008996 = 13142^2 + 5386^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53084 + ... + 56756.

Almost surely, 2^201721160 is an apocalyptic number.

201721160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201721160 is an abundant number, since it is smaller than the sum of its proper divisors (252605680).

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

201721160 is a wasteful number, since it uses less digits than its factorization.

201721160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5057 (or 5053 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 201721160 is about 14202.8574589763. The cubic root of 201721160 is about 586.4763257056.

Adding to 201721160 its reverse (61127102), we get a palindrome (262848262).

The spelling of 201721160 in words is "two hundred one million, seven hundred twenty-one thousand, one hundred sixty".