13521125512 has 8 divisors (see below), whose sum is σ = 25352110350. Its totient is φ = 6760562752.

The previous prime is 13521125467. The next prime is 13521125543. The reversal of 13521125512 is 21552112531.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 13217181156 + 303944356 = 114966^2 + 17434^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×13521125512² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 845070337 + ... + 845070352.

Almost surely, 2^13521125512 is an apocalyptic number.

It is an amenable number.

13521125512 is a deficient number, since it is larger than the sum of its proper divisors (11830984838).

13521125512 is a wasteful number, since it uses less digits than its factorization.

13521125512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1690140695 (or 1690140691 counting only the distinct ones).

The product of its digits is 3000, while the sum is 28.

The spelling of 13521125512 in words is "thirteen billion, five hundred twenty-one million, one hundred twenty-five thousand, five hundred twelve".