11521230151521 has 4 divisors (see below), whose sum is σ = 15361640202032. Its totient is φ = 7680820101012.

The previous prime is 11521230151511. The next prime is 11521230151549. The reversal of 11521230151521 is 12515103212511.

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 not a de Polignac number, because 11521230151521 - 2²³ = 11521221762913 is a prime.

It is a super-2 number, since 2×11521230151521² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11521230151511) 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, 1920205025251 + ... + 1920205025256.

It is an arithmetic number, because the mean of its divisors is an integer number (3840410050508).

Almost surely, 2^{11521230151521} is an apocalyptic number.

It is an amenable number.

11521230151521 is a deficient number, since it is larger than the sum of its proper divisors (3840410050511).

11521230151521 is an equidigital number, since it uses as much as digits as its factorization.

11521230151521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3840410050510.

The product of its (nonzero) digits is 3000, while the sum is 30.

The spelling of 11521230151521 in words is "eleven trillion, five hundred twenty-one billion, two hundred thirty million, one hundred fifty-one thousand, five hundred twenty-one".