21623523104161 has 24 divisors (see below), whose sum is σ = 24104868986016. Its totient is φ = 19237109670720.

The previous prime is 21623523104119. The next prime is 21623523104173. The reversal of 21623523104161 is 16140132532612.

It is not a de Polignac number, because 21623523104161 - 2¹¹ = 21623523102113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21623523104161.

It is not an unprimeable number, because it can be changed into a prime (21623523104461) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 212492485 + ... + 212594221.

It is an arithmetic number, because the mean of its divisors is an integer number (1004369541084).

Almost surely, 2^{21623523104161} is an apocalyptic number.

It is an amenable number.

21623523104161 is a deficient number, since it is larger than the sum of its proper divisors (2481345881855).

21623523104161 is a wasteful number, since it uses less digits than its factorization.

21623523104161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110589 (or 110542 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

Adding to 21623523104161 its reverse (16140132532612), we get a palindrome (37763655636773).

The spelling of 21623523104161 in words is "twenty-one trillion, six hundred twenty-three billion, five hundred twenty-three million, one hundred four thousand, one hundred sixty-one".