16020572016421 has 16 divisors (see below), whose sum is σ = 18903381360640. Its totient is φ = 13286467473840.

The previous prime is 16020572016401. The next prime is 16020572016433. The reversal of 16020572016421 is 12461027502061.

It is a cyclic number.

It is not a de Polignac number, because 16020572016421 - 2²⁵ = 16020538461989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16020572016401) 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, 5743341 + ... + 8063938.

It is an arithmetic number, because the mean of its divisors is an integer number (1181461335040).

Almost surely, 2^{16020572016421} is an apocalyptic number.

It is an amenable number.

16020572016421 is a deficient number, since it is larger than the sum of its proper divisors (2882809344219).

16020572016421 is a wasteful number, since it uses less digits than its factorization.

16020572016421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13812664.

The product of its (nonzero) digits is 40320, while the sum is 37.

Adding to 16020572016421 its reverse (12461027502061), we get a palindrome (28481599518482).

The spelling of 16020572016421 in words is "sixteen trillion, twenty billion, five hundred seventy-two million, sixteen thousand, four hundred twenty-one".