20310121663165 has 16 divisors (see below), whose sum is σ = 24692976979200. Its totient is φ = 16034415388992.

The previous prime is 20310121663147. The next prime is 20310121663207. The reversal of 20310121663165 is 56136612101302.

It is a cyclic number.

It is not a de Polignac number, because 20310121663165 - 2⁷ = 20310121663037 is a prime.

It is a super-3 number, since 3×20310121663165³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12044070 + ... + 13626439.

It is an arithmetic number, because the mean of its divisors is an integer number (1543311061200).

Almost surely, 2^{20310121663165} is an apocalyptic number.

It is an amenable number.

20310121663165 is a deficient number, since it is larger than the sum of its proper divisors (4382855316035).

20310121663165 is a wasteful number, since it uses less digits than its factorization.

20310121663165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25672596.

The product of its (nonzero) digits is 38880, while the sum is 37.

Adding to 20310121663165 its reverse (56136612101302), we get a palindrome (76446733764467).

The spelling of 20310121663165 in words is "twenty trillion, three hundred ten billion, one hundred twenty-one million, six hundred sixty-three thousand, one hundred sixty-five".