11315452521 has 4 divisors (see below), whose sum is σ = 15087270032. Its totient is φ = 7543635012.

The previous prime is 11315452469. The next prime is 11315452549. The reversal of 11315452521 is 12525451311.

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: 12525451311 = 3 ⋅4175150437.

It is not a de Polignac number, because 11315452521 - 2⁶ = 11315452457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11315452571) 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, 1885908751 + ... + 1885908756.

It is an arithmetic number, because the mean of its divisors is an integer number (3771817508).

Almost surely, 2^11315452521 is an apocalyptic number.

It is an amenable number.

11315452521 is a deficient number, since it is larger than the sum of its proper divisors (3771817511).

11315452521 is an equidigital number, since it uses as much as digits as its factorization.

11315452521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3771817510.

The product of its digits is 6000, while the sum is 30.

The spelling of 11315452521 in words is "eleven billion, three hundred fifteen million, four hundred fifty-two thousand, five hundred twenty-one".