1321209007 has 8 divisors (see below), whose sum is σ = 1344170880. Its totient is φ = 1298266200.

The previous prime is 1321208981. The next prime is 1321209017. The reversal of 1321209007 is 7009021231.

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 1321209007 - 2⁷ = 1321208879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321209017) 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, 264382 + ... + 269332.

It is an arithmetic number, because the mean of its divisors is an integer number (168021360).

Almost surely, 2^1321209007 is an apocalyptic number.

1321209007 is a deficient number, since it is larger than the sum of its proper divisors (22961873).

1321209007 is an equidigital number, since it uses as much as digits as its factorization.

1321209007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9533.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 1321209007 is about 36348.4388523084. The cubic root of 1321209007 is about 1097.2961158409.

The spelling of 1321209007 in words is "one billion, three hundred twenty-one million, two hundred nine thousand, seven".