10203220121 has 4 divisors (see below), whose sum is σ = 10205894244. Its totient is φ = 10200546000.

The previous prime is 10203220117. The next prime is 10203220163. The reversal of 10203220121 is 12102230201.

It is a happy number.

10203220121 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 5088824896 + 5114395225 = 71336^2 + 71515^2 .

It is a cyclic number.

It is not a de Polignac number, because 10203220121 - 2² = 10203220117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10203220096 and 10203220105.

It is not an unprimeable number, because it can be changed into a prime (10203220171) 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, 1331330 + ... + 1338971.

It is an arithmetic number, because the mean of its divisors is an integer number (2551473561).

Almost surely, 2^10203220121 is an apocalyptic number.

It is an amenable number.

10203220121 is a deficient number, since it is larger than the sum of its proper divisors (2674123).

10203220121 is an equidigital number, since it uses as much as digits as its factorization.

10203220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2674122.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 10203220121 its reverse (12102230201), we get a palindrome (22305450322).

The spelling of 10203220121 in words is "ten billion, two hundred three million, two hundred twenty thousand, one hundred twenty-one".