201921271 has 4 divisors (see below), whose sum is σ = 202249152. Its totient is φ = 201593392.

The previous prime is 201921263. The next prime is 201921281. The reversal of 201921271 is 172129102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 201921271 - 2³ = 201921263 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 (201921211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163015 + ... + 164248.

It is an arithmetic number, because the mean of its divisors is an integer number (50562288).

Almost surely, 2^201921271 is an apocalyptic number.

201921271 is a deficient number, since it is larger than the sum of its proper divisors (327881).

201921271 is an equidigital number, since it uses as much as digits as its factorization.

201921271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327880.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 201921271 is about 14209.9004570757. The cubic root of 201921271 is about 586.6701932826.

It can be divided in two parts, 20 and 1921271, that added together give a palindrome (1921291).

The spelling of 201921271 in words is "two hundred one million, nine hundred twenty-one thousand, two hundred seventy-one".