10203121 has 4 divisors (see below), whose sum is σ = 10304244. Its totient is φ = 10102000.

The previous prime is 10203119. The next prime is 10203181. The reversal of 10203121 is 12130201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4562496 + 5640625 = 2136^2 + 2375^2 .

It is a cyclic number.

It is not a de Polignac number, because 10203121 - 2¹ = 10203119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10203098 and 10203107.

It is not an unprimeable number, because it can be changed into a prime (10203101) 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, 50410 + ... + 50611.

It is an arithmetic number, because the mean of its divisors is an integer number (2576061).

Almost surely, 2^10203121 is an apocalyptic number.

It is an amenable number.

10203121 is a deficient number, since it is larger than the sum of its proper divisors (101123).

10203121 is a wasteful number, since it uses less digits than its factorization.

10203121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101122.

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

The square root of 10203121 is about 3194.2324586667. The cubic root of 10203121 is about 216.8924056214.

Adding to 10203121 its reverse (12130201), we get a palindrome (22333322).

The spelling of 10203121 in words is "ten million, two hundred three thousand, one hundred twenty-one".