20203121 has 4 divisors (see below), whose sum is σ = 20487744. Its totient is φ = 19918500.

The previous prime is 20203093. The next prime is 20203129. The reversal of 20203121 is 12130202.

It is a happy number.

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 20203121 - 2¹⁰ = 20202097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20203129) 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, 142205 + ... + 142346.

It is an arithmetic number, because the mean of its divisors is an integer number (5121936).

Almost surely, 2^20203121 is an apocalyptic number.

It is an amenable number.

20203121 is a deficient number, since it is larger than the sum of its proper divisors (284623).

20203121 is an equidigital number, since it uses as much as digits as its factorization.

20203121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284622.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 20203121 is about 4494.7882041315. The cubic root of 20203121 is about 272.3575935778.

Adding to 20203121 its reverse (12130202), we get a palindrome (32333323).

The spelling of 20203121 in words is "twenty million, two hundred three thousand, one hundred twenty-one".