10203144221 has 4 divisors (see below), whose sum is σ = 10203569244. Its totient is φ = 10202719200.

The previous prime is 10203144209. The next prime is 10203144239. The reversal of 10203144221 is 12244130201.

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 2663695321 + 7539448900 = 51611^2 + 86830^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10203144221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10203144193 and 10203144202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10203144521) 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, 174200 + ... + 225281.

It is an arithmetic number, because the mean of its divisors is an integer number (2550892311).

Almost surely, 2^10203144221 is an apocalyptic number.

It is an amenable number.

10203144221 is a deficient number, since it is larger than the sum of its proper divisors (425023).

10203144221 is an equidigital number, since it uses as much as digits as its factorization.

10203144221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425022.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 10203144221 its reverse (12244130201), we get a palindrome (22447274422).

The spelling of 10203144221 in words is "ten billion, two hundred three million, one hundred forty-four thousand, two hundred twenty-one".