16012254521 has 4 divisors (see below), whose sum is σ = 16070060772. Its totient is φ = 15954448272.

The previous prime is 16012254497. The next prime is 16012254523. The reversal of 16012254521 is 12545221061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12545221061 = 43 ⋅291749327.

It can be written as a sum of positive squares in 2 ways, for example, as 1609614400 + 14402640121 = 40120^2 + 120011^2 .

It is a cyclic number.

It is not a de Polignac number, because 16012254521 - 2¹⁰ = 16012253497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16012254523) 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, 28902710 + ... + 28903263.

It is an arithmetic number, because the mean of its divisors is an integer number (4017515193).

Almost surely, 2^16012254521 is an apocalyptic number.

It is an amenable number.

16012254521 is a deficient number, since it is larger than the sum of its proper divisors (57806251).

16012254521 is an equidigital number, since it uses as much as digits as its factorization.

16012254521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57806250.

The product of its (nonzero) digits is 4800, while the sum is 29.

Adding to 16012254521 its reverse (12545221061), we get a palindrome (28557475582).

The spelling of 16012254521 in words is "sixteen billion, twelve million, two hundred fifty-four thousand, five hundred twenty-one".