1243201321 has 8 divisors (see below), whose sum is σ = 1248224040. Its totient is φ = 1238189568.

The previous prime is 1243201301. The next prime is 1243201327. The reversal of 1243201321 is 1231023421.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1625625 + 1241575696 = 1275^2 + 35236^2 .

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 1243201321 - 2²¹ = 1241104169 is a prime.

It is a super-2 number, since 2×1243201321² = 3091099049072290082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243201327) 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, 279765 + ... + 284173.

It is an arithmetic number, because the mean of its divisors is an integer number (156028005).

Almost surely, 2^1243201321 is an apocalyptic number.

It is an amenable number.

1243201321 is a deficient number, since it is larger than the sum of its proper divisors (5022719).

1243201321 is an equidigital number, since it uses as much as digits as its factorization.

1243201321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5483.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1243201321 is about 35259.0601264413. The cubic root of 1243201321 is about 1075.2608189210.

Adding to 1243201321 its reverse (1231023421), we get a palindrome (2474224742).

The spelling of 1243201321 in words is "one billion, two hundred forty-three million, two hundred one thousand, three hundred twenty-one".