21184568461 has 32 divisors (see below), whose sum is σ = 24710676480. Its totient is φ = 17788377600.

The previous prime is 21184568459. The next prime is 21184568501. The reversal of 21184568461 is 16486548112.

It is not a de Polignac number, because 21184568461 - 2¹ = 21184568459 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21184568161) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49151916 + ... + 49152346.

It is an arithmetic number, because the mean of its divisors is an integer number (772208640).

Almost surely, 2^21184568461 is an apocalyptic number.

It is an amenable number.

21184568461 is a deficient number, since it is larger than the sum of its proper divisors (3526108019).

21184568461 is a wasteful number, since it uses less digits than its factorization.

21184568461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105.

The product of its digits is 368640, while the sum is 46.

The spelling of 21184568461 in words is "twenty-one billion, one hundred eighty-four million, five hundred sixty-eight thousand, four hundred sixty-one".