1303503440221 has 4 divisors (see below), whose sum is σ = 1303507705500. Its totient is φ = 1303499174944.

The previous prime is 1303503440219. The next prime is 1303503440243. The reversal of 1303503440221 is 1220443053031.

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 76736756196 + 1226766684025 = 277014^2 + 1107595^2 .

It is a cyclic number.

It is not a de Polignac number, because 1303503440221 - 2¹ = 1303503440219 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 1303503440221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1303503440251) 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, 1635616 + ... + 2298313.

It is an arithmetic number, because the mean of its divisors is an integer number (325876926375).

Almost surely, 2^{1303503440221} is an apocalyptic number.

It is an amenable number.

1303503440221 is a deficient number, since it is larger than the sum of its proper divisors (4265279).

1303503440221 is an equidigital number, since it uses as much as digits as its factorization.

1303503440221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4265278.

The product of its (nonzero) digits is 8640, while the sum is 28.

Adding to 1303503440221 its reverse (1220443053031), we get a palindrome (2523946493252).

The spelling of 1303503440221 in words is "one trillion, three hundred three billion, five hundred three million, four hundred forty thousand, two hundred twenty-one".