1321343643 has 8 divisors (see below), whose sum is σ = 1761960528. Its totient is φ = 880811264.

The previous prime is 1321343609. The next prime is 1321343669. The reversal of 1321343643 is 3463431231.

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 1321343643 - 2²⁵ = 1287789211 is a prime.

It is a super-2 number, since 2×1321343643² = 3491898045793022898, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1321343643.

It is not an unprimeable number, because it can be changed into a prime (1321343693) 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, 44371 + ... + 67907.

It is an arithmetic number, because the mean of its divisors is an integer number (220245066).

Almost surely, 2^1321343643 is an apocalyptic number.

1321343643 is a deficient number, since it is larger than the sum of its proper divisors (440616885).

1321343643 is a wasteful number, since it uses less digits than its factorization.

1321343643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42253.

The product of its digits is 15552, while the sum is 30.

The square root of 1321343643 is about 36350.2908241461. The cubic root of 1321343643 is about 1097.3333873958. Note that the first 4 decimals are identical.

Adding to 1321343643 its reverse (3463431231), we get a palindrome (4784774874).

The spelling of 1321343643 in words is "one billion, three hundred twenty-one million, three hundred forty-three thousand, six hundred forty-three".