20121163 has 4 divisors (see below), whose sum is σ = 20131848. Its totient is φ = 20110480.

The previous prime is 20121137. The next prime is 20121169. The reversal of 20121163 is 36112102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20121163 - 2⁹ = 20120651 is a prime.

It is a super-2 number, since 2×20121163² = 809722400945138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20121169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1681 + ... + 6562.

It is an arithmetic number, because the mean of its divisors is an integer number (5032962).

Almost surely, 2^20121163 is an apocalyptic number.

20121163 is a deficient number, since it is larger than the sum of its proper divisors (10685).

20121163 is an equidigital number, since it uses as much as digits as its factorization.

20121163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10684.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 20121163 is about 4485.6619355453. The cubic root of 20121163 is about 271.9888034246.

Adding to 20121163 its reverse (36112102), we get a palindrome (56233265).

It can be divided in two parts, 20121 and 163, that multiplied together give a palindrome (3279723).

The spelling of 20121163 in words is "twenty million, one hundred twenty-one thousand, one hundred sixty-three".