201312425521 has 4 divisors (see below), whose sum is σ = 202645620544. Its totient is φ = 199979230500.

The previous prime is 201312425491. The next prime is 201312425527. The reversal of 201312425521 is 125524213102.

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, and also an emirpimes, since its reverse is a distinct semiprime: 125524213102 = 2 ⋅62762106551.

It is a cyclic number.

It is not a de Polignac number, because 201312425521 - 2⁷ = 201312425393 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201312425521.

It is not an unprimeable number, because it can be changed into a prime (201312425527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 666597285 + ... + 666597586.

It is an arithmetic number, because the mean of its divisors is an integer number (50661405136).

Almost surely, 2^201312425521 is an apocalyptic number.

It is an amenable number.

201312425521 is a deficient number, since it is larger than the sum of its proper divisors (1333195023).

201312425521 is a wasteful number, since it uses less digits than its factorization.

201312425521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333195022.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 201312425521 its reverse (125524213102), we get a palindrome (326836638623).

The spelling of 201312425521 in words is "two hundred one billion, three hundred twelve million, four hundred twenty-five thousand, five hundred twenty-one".