21122840161 has 8 divisors (see below), whose sum is σ = 21430056384. Its totient is φ = 20815893840.

The previous prime is 21122840129. The next prime is 21122840173. The reversal of 21122840161 is 16104822112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21122840161 - 2⁵ = 21122840129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21122840261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92935 + ... + 225571.

It is an arithmetic number, because the mean of its divisors is an integer number (2678757048).

Almost surely, 2^21122840161 is an apocalyptic number.

It is an amenable number.

21122840161 is a deficient number, since it is larger than the sum of its proper divisors (307216223).

21122840161 is a wasteful number, since it uses less digits than its factorization.

21122840161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134951.

The product of its (nonzero) digits is 1536, while the sum is 28.

The spelling of 21122840161 in words is "twenty-one billion, one hundred twenty-two million, eight hundred forty thousand, one hundred sixty-one".