201521423 has 8 divisors (see below), whose sum is σ = 214252128. Its totient is φ = 189121504.

The previous prime is 201521413. The next prime is 201521431. The reversal of 201521423 is 324125102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201521423 is a prime.

It is a super-2 number, since 2×201521423² = 81221767855889858, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201521395 and 201521404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201521413) 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 7 ways as a sum of consecutive naturals, for example, 81440 + ... + 83877.

It is an arithmetic number, because the mean of its divisors is an integer number (26781516).

Almost surely, 2^201521423 is an apocalyptic number.

201521423 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

201521423 is a deficient number, since it is larger than the sum of its proper divisors (12730705).

201521423 is a wasteful number, since it uses less digits than its factorization.

201521423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165393.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 201521423 is about 14195.8241395137. The cubic root of 201521423 is about 586.2826925636.

Adding to 201521423 its reverse (324125102), we get a palindrome (525646525).

The spelling of 201521423 in words is "two hundred one million, five hundred twenty-one thousand, four hundred twenty-three".