20305216465121 has 16 divisors (see below), whose sum is σ = 23229847255680. Its totient is φ = 17386558398720.

The previous prime is 20305216465117. The next prime is 20305216465123. The reversal of 20305216465121 is 12156461250302.

It is not a de Polignac number, because 20305216465121 - 2² = 20305216465117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20305216465123) 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, 305349686 + ... + 305416176.

It is an arithmetic number, because the mean of its divisors is an integer number (1451865453480).

Almost surely, 2^{20305216465121} is an apocalyptic number.

It is an amenable number.

20305216465121 is a deficient number, since it is larger than the sum of its proper divisors (2924630790559).

20305216465121 is a wasteful number, since it uses less digits than its factorization.

20305216465121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110744.

The product of its (nonzero) digits is 86400, while the sum is 38.

The spelling of 20305216465121 in words is "twenty trillion, three hundred five billion, two hundred sixteen million, four hundred sixty-five thousand, one hundred twenty-one".