21475762050181 has 16 divisors (see below), whose sum is σ = 22949817428160. Its totient is φ = 20036249925120.

The previous prime is 21475762050173. The next prime is 21475762050187. The reversal of 21475762050181 is 18105026757412.

It is a cyclic number.

It is not a de Polignac number, because 21475762050181 - 2³ = 21475762050173 is a prime.

It is a super-2 number, since 2×21475762050181² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21475762050187) 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, 2272371 + ... + 6936511.

It is an arithmetic number, because the mean of its divisors is an integer number (1434363589260).

Almost surely, 2^{21475762050181} is an apocalyptic number.

It is an amenable number.

21475762050181 is a deficient number, since it is larger than the sum of its proper divisors (1474055377979).

21475762050181 is a wasteful number, since it uses less digits than its factorization.

21475762050181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4667844.

The product of its (nonzero) digits is 940800, while the sum is 49.

The spelling of 21475762050181 in words is "twenty-one trillion, four hundred seventy-five billion, seven hundred sixty-two million, fifty thousand, one hundred eighty-one".