201326605521 has 4 divisors (see below), whose sum is σ = 268435474032. Its totient is φ = 134217737012.

The previous prime is 201326605511. The next prime is 201326605531. The reversal of 201326605521 is 125506623102.

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 an interprime number because it is at equal distance from previous prime (201326605511) and next prime (201326605531).

It is a cyclic number.

It is not a de Polignac number, because 201326605521 - 2⁶ = 201326605457 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (201326605511) 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, 33554434251 + ... + 33554434256.

It is an arithmetic number, because the mean of its divisors is an integer number (67108868508).

Almost surely, 2^201326605521 is an apocalyptic number.

It is an amenable number.

201326605521 is a deficient number, since it is larger than the sum of its proper divisors (67108868511).

201326605521 is an equidigital number, since it uses as much as digits as its factorization.

201326605521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67108868510.

The product of its (nonzero) digits is 21600, while the sum is 33.

The spelling of 201326605521 in words is "two hundred one billion, three hundred twenty-six million, six hundred five thousand, five hundred twenty-one".