203100123221 has 4 divisors (see below), whose sum is σ = 203890396332. Its totient is φ = 202309850112.

The previous prime is 203100123169. The next prime is 203100123313. The reversal of 203100123221 is 122321001302.

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 196793380996 + 6306742225 = 443614^2 + 79415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203100123221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 203100123221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203100123521) 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, 395136170 + ... + 395136683.

It is an arithmetic number, because the mean of its divisors is an integer number (50972599083).

Almost surely, 2^203100123221 is an apocalyptic number.

It is an amenable number.

203100123221 is a deficient number, since it is larger than the sum of its proper divisors (790273111).

203100123221 is an equidigital number, since it uses as much as digits as its factorization.

203100123221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790273110.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 203100123221 its reverse (122321001302), we get a palindrome (325421124523).

The spelling of 203100123221 in words is "two hundred three billion, one hundred million, one hundred twenty-three thousand, two hundred twenty-one".