1321004451 has 32 divisors (see below), whose sum is σ = 1956951360. Its totient is φ = 787359744.

The previous prime is 1321004449. The next prime is 1321004459. The reversal of 1321004451 is 1544001231.

It is not a de Polignac number, because 1321004451 - 2¹ = 1321004449 is a prime.

It is a super-2 number, since 2×1321004451² = 3490105519123622802, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1321004459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 334255 + ... + 338183.

It is an arithmetic number, because the mean of its divisors is an integer number (61154730).

Almost surely, 2^1321004451 is an apocalyptic number.

1321004451 is a deficient number, since it is larger than the sum of its proper divisors (635946909).

1321004451 is a wasteful number, since it uses less digits than its factorization.

1321004451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4215.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1321004451 is about 36345.6249224030. The cubic root of 1321004451 is about 1097.2394833455.

Adding to 1321004451 its reverse (1544001231), we get a palindrome (2865005682).

The spelling of 1321004451 in words is "one billion, three hundred twenty-one million, four thousand, four hundred fifty-one".