13521125501 has 4 divisors (see below), whose sum is σ = 14561212092. Its totient is φ = 12481038912.

The previous prime is 13521125467. The next prime is 13521125543. The reversal of 13521125501 is 10552112531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4716118276 + 8805007225 = 68674^2 + 93835^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13521125501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13521125701) 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, 520043276 + ... + 520043301.

It is an arithmetic number, because the mean of its divisors is an integer number (3640303023).

Almost surely, 2^13521125501 is an apocalyptic number.

It is an amenable number.

13521125501 is a deficient number, since it is larger than the sum of its proper divisors (1040086591).

13521125501 is a wasteful number, since it uses less digits than its factorization.

13521125501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040086590.

The product of its (nonzero) digits is 1500, while the sum is 26.

The spelling of 13521125501 in words is "thirteen billion, five hundred twenty-one million, one hundred twenty-five thousand, five hundred one".