203122220321 has 4 divisors (see below), whose sum is σ = 203130092100. Its totient is φ = 203114348544.

The previous prime is 203122220303. The next prime is 203122220369. The reversal of 203122220321 is 123022221302.

It is a happy number.

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 196155981025 + 6966239296 = 442895^2 + 83464^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203122220321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 203122220293 and 203122220302.

It is not an unprimeable number, because it can be changed into a prime (203122220621) 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, 3897056 + ... + 3948833.

It is an arithmetic number, because the mean of its divisors is an integer number (50782523025).

Almost surely, 2^203122220321 is an apocalyptic number.

It is an amenable number.

203122220321 is a deficient number, since it is larger than the sum of its proper divisors (7871779).

203122220321 is an equidigital number, since it uses as much as digits as its factorization.

203122220321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7871778.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 203122220321 its reverse (123022221302), we get a palindrome (326144441623).

The spelling of 203122220321 in words is "two hundred three billion, one hundred twenty-two million, two hundred twenty thousand, three hundred twenty-one".