203203211221 has 4 divisors (see below), whose sum is σ = 212038133472. Its totient is φ = 194368288972.

The previous prime is 203203211219. The next prime is 203203211231. The reversal of 203203211221 is 122112302302.

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.

It is a cyclic number.

It is not a de Polignac number, because 203203211221 - 2¹ = 203203211219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203203211201) 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, 4417461091 + ... + 4417461136.

It is an arithmetic number, because the mean of its divisors is an integer number (53009533368).

Almost surely, 2^203203211221 is an apocalyptic number.

It is an amenable number.

203203211221 is a deficient number, since it is larger than the sum of its proper divisors (8834922251).

203203211221 is an equidigital number, since it uses as much as digits as its factorization.

203203211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8834922250.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 203203211221 its reverse (122112302302), we get a palindrome (325315513523).

The spelling of 203203211221 in words is "two hundred three billion, two hundred three million, two hundred eleven thousand, two hundred twenty-one".