1321353555 has 16 divisors (see below), whose sum is σ = 2122031520. Its totient is φ = 702099968.

The previous prime is 1321353533. The next prime is 1321353571. The reversal of 1321353555 is 5553531231.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1321353555 - 2¹⁰ = 1321352531 is a prime.

It is a super-2 number, since 2×1321353555² = 3491950434622276050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159702 + ... + 167771.

It is an arithmetic number, because the mean of its divisors is an integer number (132626970).

Almost surely, 2^1321353555 is an apocalyptic number.

1321353555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1321353555 is a deficient number, since it is larger than the sum of its proper divisors (800677965).

1321353555 is a wasteful number, since it uses less digits than its factorization.

1321353555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327750.

The product of its digits is 33750, while the sum is 33.

The square root of 1321353555 is about 36350.4271639275. The cubic root of 1321353555 is about 1097.3361312546.

Adding to 1321353555 its reverse (5553531231), we get a palindrome (6874884786).

The spelling of 1321353555 in words is "one billion, three hundred twenty-one million, three hundred fifty-three thousand, five hundred fifty-five".