16541452421 has 16 divisors (see below), whose sum is σ = 19854475200. Its totient is φ = 13614490368.

The previous prime is 16541452393. The next prime is 16541452429. The reversal of 16541452421 is 12425414561.

16541452421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 16541452421 - 2²² = 16537258117 is a prime.

It is a super-2 number, since 2×16541452421² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16541452429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1965491 + ... + 1973888.

It is an arithmetic number, because the mean of its divisors is an integer number (1240904700).

Almost surely, 2^16541452421 is an apocalyptic number.

It is an amenable number.

16541452421 is a deficient number, since it is larger than the sum of its proper divisors (3313022779).

16541452421 is a wasteful number, since it uses less digits than its factorization.

16541452421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3939428.

The product of its digits is 38400, while the sum is 35.

Adding to 16541452421 its reverse (12425414561), we get a palindrome (28966866982).

The spelling of 16541452421 in words is "sixteen billion, five hundred forty-one million, four hundred fifty-two thousand, four hundred twenty-one".