20103121 has 4 divisors (see below), whose sum is σ = 21161200. Its totient is φ = 19045044.

The previous prime is 20103113. The next prime is 20103137. The reversal of 20103121 is 12130102.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12130102 = 2 ⋅6065051.

It is a cyclic number.

It is not a de Polignac number, because 20103121 - 2³ = 20103113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20103098 and 20103107.

It is not an unprimeable number, because it can be changed into a prime (20103101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 529011 + ... + 529048.

It is an arithmetic number, because the mean of its divisors is an integer number (5290300).

Almost surely, 2^20103121 is an apocalyptic number.

It is an amenable number.

20103121 is a deficient number, since it is larger than the sum of its proper divisors (1058079).

20103121 is a wasteful number, since it uses less digits than its factorization.

20103121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1058078.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 20103121 is about 4483.6504101011. The cubic root of 20103121 is about 271.9074845758.

Adding to 20103121 its reverse (12130102), we get a palindrome (32233223).

The spelling of 20103121 in words is "twenty million, one hundred three thousand, one hundred twenty-one".