1321421503 has 16 divisors (see below), whose sum is σ = 1363614336. Its totient is φ = 1280046240.

The previous prime is 1321421501. The next prime is 1321421527. The reversal of 1321421503 is 3051241231.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1321421503 - 2¹ = 1321421501 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 (1321421501) 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, 1628968 + ... + 1629778.

It is an arithmetic number, because the mean of its divisors is an integer number (85225896).

Almost surely, 2^1321421503 is an apocalyptic number.

1321421503 is a deficient number, since it is larger than the sum of its proper divisors (42192833).

1321421503 is an equidigital number, since it uses as much as digits as its factorization.

1321421503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1254.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1321421503 is about 36351.3617764177. The cubic root of 1321421503 is about 1097.3549403808.

Adding to 1321421503 its reverse (3051241231), we get a palindrome (4372662734).

The spelling of 1321421503 in words is "one billion, three hundred twenty-one million, four hundred twenty-one thousand, five hundred three".