20043121 has 4 divisors (see below), whose sum is σ = 22906432. Its totient is φ = 17179812.

The previous prime is 20043083. The next prime is 20043151. The reversal of 20043121 is 12134002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20043121 - 2⁷ = 20042993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20043151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1431645 + ... + 1431658.

It is an arithmetic number, because the mean of its divisors is an integer number (5726608).

Almost surely, 2^20043121 is an apocalyptic number.

It is an amenable number.

20043121 is a deficient number, since it is larger than the sum of its proper divisors (2863311).

20043121 is an equidigital number, since it uses as much as digits as its factorization.

20043121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2863310.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 20043121 is about 4476.9544335407. The cubic root of 20043121 is about 271.6367022960.

Adding to 20043121 its reverse (12134002), we get a palindrome (32177123).

It can be divided in two parts, 20043 and 121, that added together give a square (20164 = 142²).

The spelling of 20043121 in words is "twenty million, forty-three thousand, one hundred twenty-one".