203342400221 has 4 divisors (see below), whose sum is σ = 204560019552. Its totient is φ = 202124780892.

The previous prime is 203342400197. The next prime is 203342400223. The reversal of 203342400221 is 122004243302.

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: 122004243302 = 2 ⋅61002121651.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203342400221 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 (203342400223) 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, 608809415 + ... + 608809748.

It is an arithmetic number, because the mean of its divisors is an integer number (51140004888).

Almost surely, 2^203342400221 is an apocalyptic number.

It is an amenable number.

203342400221 is a deficient number, since it is larger than the sum of its proper divisors (1217619331).

203342400221 is a wasteful number, since it uses less digits than its factorization.

203342400221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1217619330.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 203342400221 its reverse (122004243302), we get a palindrome (325346643523).

The spelling of 203342400221 in words is "two hundred three billion, three hundred forty-two million, four hundred thousand, two hundred twenty-one".