203205245221 has 16 divisors (see below), whose sum is σ = 225484056000. Its totient is φ = 181587024000.

The previous prime is 203205245153. The next prime is 203205245231. The reversal of 203205245221 is 122542502302.

It is a cyclic number.

It is not a de Polignac number, because 203205245221 - 2²⁷ = 203071027493 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 203205245221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203205245231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 503496 + ... + 812353.

It is an arithmetic number, because the mean of its divisors is an integer number (14092753500).

Almost surely, 2^203205245221 is an apocalyptic number.

It is an amenable number.

203205245221 is a deficient number, since it is larger than the sum of its proper divisors (22278810779).

203205245221 is a wasteful number, since it uses less digits than its factorization.

203205245221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1316100.

The product of its (nonzero) digits is 9600, while the sum is 28.

Adding to 203205245221 its reverse (122542502302), we get a palindrome (325747747523).

The spelling of 203205245221 in words is "two hundred three billion, two hundred five million, two hundred forty-five thousand, two hundred twenty-one".