1321201321 has 8 divisors (see below), whose sum is σ = 1447344000. Its totient is φ = 1196064240.

The previous prime is 1321201303. The next prime is 1321201339. The reversal of 1321201321 is 1231021231.

It is an interprime number because it is at equal distance from previous prime (1321201303) and next prime (1321201339).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1321201321 - 2¹¹ = 1321199273 is a prime.

It is a super-2 number, since 2×1321201321² = 3491145861224290082, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1321201295 and 1321201304.

It is not an unprimeable number, because it can be changed into a prime (1321201391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 248646 + ... + 253903.

It is an arithmetic number, because the mean of its divisors is an integer number (180918000).

Almost surely, 2^1321201321 is an apocalyptic number.

1321201321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1321201321 is a deficient number, since it is larger than the sum of its proper divisors (126142679).

1321201321 is a wasteful number, since it uses less digits than its factorization.

1321201321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502799.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1321201321 is about 36348.3331254681. Note that the first 3 decimals coincide. The cubic root of 1321201321 is about 1097.2939880337.

Adding to 1321201321 its reverse (1231021231), we get a palindrome (2552222552).

The spelling of 1321201321 in words is "one billion, three hundred twenty-one million, two hundred one thousand, three hundred twenty-one".