16105143125421 has 64 divisors (see below), whose sum is σ = 27730510451200. Its totient is φ = 9046999641600.

The previous prime is 16105143125419. The next prime is 16105143125431. The reversal of 16105143125421 is 12452134150161.

16105143125421 is a `hidden beast` number, since 1 + 6 + 10 + 51 + 43 + 12 + 542 + 1 = 666.

It is not a de Polignac number, because 16105143125421 - 2¹ = 16105143125419 is a prime.

It is a super-2 number, since 2×16105143125421² (a number of 27 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 (16105143125431) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20234961 + ... + 21015801.

It is an arithmetic number, because the mean of its divisors is an integer number (433289225800).

Almost surely, 2^{16105143125421} is an apocalyptic number.

It is an amenable number.

16105143125421 is a deficient number, since it is larger than the sum of its proper divisors (11625367325779).

16105143125421 is a wasteful number, since it uses less digits than its factorization.

16105143125421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782707 (or 782701 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

Adding to 16105143125421 its reverse (12452134150161), we get a palindrome (28557277275582).

The spelling of 16105143125421 in words is "sixteen trillion, one hundred five billion, one hundred forty-three million, one hundred twenty-five thousand, four hundred twenty-one".