11521352129 has 4 divisors (see below), whose sum is σ = 13167259584. Its totient is φ = 9875444676.

The previous prime is 11521352111. The next prime is 11521352173. The reversal of 11521352129 is 92125312511.

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 a de Polignac number, because none of the positive numbers 2^k-11521352129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11521352095 and 11521352104.

It is not an unprimeable number, because it can be changed into a prime (11521352329) 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, 822953717 + ... + 822953730.

It is an arithmetic number, because the mean of its divisors is an integer number (3291814896).

Almost surely, 2^11521352129 is an apocalyptic number.

It is an amenable number.

11521352129 is a deficient number, since it is larger than the sum of its proper divisors (1645907455).

11521352129 is an equidigital number, since it uses as much as digits as its factorization.

11521352129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1645907454.

The product of its digits is 5400, while the sum is 32.

The spelling of 11521352129 in words is "eleven billion, five hundred twenty-one million, three hundred fifty-two thousand, one hundred twenty-nine".