21424804617161 has 16 divisors (see below), whose sum is σ = 24178863614400. Its totient is φ = 18805159464000.

The previous prime is 21424804617149. The next prime is 21424804617233. The reversal of 21424804617161 is 16171640842412.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21424804617161 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21424804616161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19897511 + ... + 20946611.

It is an arithmetic number, because the mean of its divisors is an integer number (1511178975900).

Almost surely, 2^{21424804617161} is an apocalyptic number.

It is an amenable number.

21424804617161 is a deficient number, since it is larger than the sum of its proper divisors (2754058997239).

21424804617161 is a wasteful number, since it uses less digits than its factorization.

21424804617161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1113160.

The product of its (nonzero) digits is 516096, while the sum is 47.

The spelling of 21424804617161 in words is "twenty-one trillion, four hundred twenty-four billion, eight hundred four million, six hundred seventeen thousand, one hundred sixty-one".