201521230253 has 4 divisors (see below), whose sum is σ = 230309977440. Its totient is φ = 172732483068.

The previous prime is 201521230201. The next prime is 201521230333. The reversal of 201521230253 is 352032125102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 201521230253 - 2¹⁰ = 201521229229 is a prime.

It is a super-2 number, since 2×201521230253² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201521230553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14394373583 + ... + 14394373596.

It is an arithmetic number, because the mean of its divisors is an integer number (57577494360).

Almost surely, 2^201521230253 is an apocalyptic number.

It is an amenable number.

201521230253 is a deficient number, since it is larger than the sum of its proper divisors (28788747187).

201521230253 is an equidigital number, since it uses as much as digits as its factorization.

201521230253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28788747186.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 201521230253 its reverse (352032125102), we get a palindrome (553553355355).

The spelling of 201521230253 in words is "two hundred one billion, five hundred twenty-one million, two hundred thirty thousand, two hundred fifty-three".