20040121 has 4 divisors (see below), whose sum is σ = 20058192. Its totient is φ = 20022052.

The previous prime is 20040071. The next prime is 20040133. The reversal of 20040121 is 12104002.

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 20040121 - 2⁷ = 20039993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20040098 and 20040107.

It is not an unprimeable number, because it can be changed into a prime (20040151) 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, 7255 + ... + 9628.

It is an arithmetic number, because the mean of its divisors is an integer number (5014548).

Almost surely, 2^20040121 is an apocalyptic number.

It is an amenable number.

20040121 is a deficient number, since it is larger than the sum of its proper divisors (18071).

20040121 is a wasteful number, since it uses less digits than its factorization.

20040121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18070.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 20040121 is about 4476.6193718028. The cubic root of 20040121 is about 271.6231490048.

Adding to 20040121 its reverse (12104002), we get a palindrome (32144123).

The spelling of 20040121 in words is "twenty million, forty thousand, one hundred twenty-one".