203201022221 has 4 divisors (see below), whose sum is σ = 205649227392. Its totient is φ = 200752817052.

The previous prime is 203201022121. The next prime is 203201022251. The reversal of 203201022221 is 122220102302.

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: 122220102302 = 2 ⋅61110051151.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203201022221 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 203201022221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203201022251) 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, 1224102461 + ... + 1224102626.

It is an arithmetic number, because the mean of its divisors is an integer number (51412306848).

Almost surely, 2^203201022221 is an apocalyptic number.

It is an amenable number.

203201022221 is a deficient number, since it is larger than the sum of its proper divisors (2448205171).

203201022221 is an equidigital number, since it uses as much as digits as its factorization.

203201022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2448205170.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 203201022221 its reverse (122220102302), we get a palindrome (325421124523).

The spelling of 203201022221 in words is "two hundred three billion, two hundred one million, twenty-two thousand, two hundred twenty-one".