1321098001 has 4 divisors (see below), whose sum is σ = 1321173504. Its totient is φ = 1321022500.

The previous prime is 1321097993. The next prime is 1321098011. The reversal of 1321098001 is 1008901231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1321098001 - 2³ = 1321097993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321098011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3576 + ... + 51526.

It is an arithmetic number, because the mean of its divisors is an integer number (330293376).

Almost surely, 2^1321098001 is an apocalyptic number.

It is an amenable number.

1321098001 is a deficient number, since it is larger than the sum of its proper divisors (75503).

1321098001 is an equidigital number, since it uses as much as digits as its factorization.

1321098001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75502.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 1321098001 is about 36346.9118495643. The cubic root of 1321098001 is about 1097.2653839220.

Adding to 1321098001 its reverse (1008901231), we get a palindrome (2329999232).

The spelling of 1321098001 in words is "one billion, three hundred twenty-one million, ninety-eight thousand, one".