21416025121 has 16 divisors (see below), whose sum is σ = 22471271424. Its totient is φ = 20371338064.

The previous prime is 21416025079. The next prime is 21416025149. The reversal of 21416025121 is 12152061412.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21416025121 is a prime.

It is a super-2 number, since 2×21416025121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21416028121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6070260 + ... + 6073786.

It is an arithmetic number, because the mean of its divisors is an integer number (1404454464).

Almost surely, 2^21416025121 is an apocalyptic number.

It is an amenable number.

21416025121 is a deficient number, since it is larger than the sum of its proper divisors (1055246303).

21416025121 is a wasteful number, since it uses less digits than its factorization.

21416025121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4940.

The product of its (nonzero) digits is 960, while the sum is 25.

Adding to 21416025121 its reverse (12152061412), we get a palindrome (33568086533).

The spelling of 21416025121 in words is "twenty-one billion, four hundred sixteen million, twenty-five thousand, one hundred twenty-one".