201521334 has 32 divisors (see below), whose sum is σ = 484865280. Its totient is φ = 54546912.

The previous prime is 201521311. The next prime is 201521381. The reversal of 201521334 is 433125102.

It is a super-2 number, since 2×201521334² = 81221696114279112, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 201521334.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 125469 + ... + 127064.

It is an arithmetic number, because the mean of its divisors is an integer number (15152040).

Almost surely, 2^201521334 is an apocalyptic number.

201521334 is an abundant number, since it is smaller than the sum of its proper divisors (283343946).

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

201521334 is a wasteful number, since it uses less digits than its factorization.

201521334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252564.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 201521334 is about 14195.8210047887. The cubic root of 201521334 is about 586.2826062549.

Adding to 201521334 its reverse (433125102), we get a palindrome (634646436).

The spelling of 201521334 in words is "two hundred one million, five hundred twenty-one thousand, three hundred thirty-four".