321221313403 has 16 divisors (see below), whose sum is σ = 345586294080. Its totient is φ = 297787539456.

The previous prime is 321221313367. The next prime is 321221313407. The reversal of 321221313403 is 304313122123.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321221313403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321221313407) 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, 515658 + ... + 953071.

It is an arithmetic number, because the mean of its divisors is an integer number (21599143380).

Almost surely, 2^321221313403 is an apocalyptic number.

321221313403 is a deficient number, since it is larger than the sum of its proper divisors (24364980677).

321221313403 is a wasteful number, since it uses less digits than its factorization.

321221313403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1469046.

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 321221313403 its reverse (304313122123), we get a palindrome (625534435526).

It can be divided in two parts, 3212213 and 13403, that added together give a square (3225616 = 1796²).

The spelling of 321221313403 in words is "three hundred twenty-one billion, two hundred twenty-one million, three hundred thirteen thousand, four hundred three".