1321202001 has 16 divisors (see below), whose sum is σ = 2014337024. Its totient is φ = 754568784.

The previous prime is 1321201997. The next prime is 1321202017. The reversal of 1321202001 is 1002021231.

It is not a de Polignac number, because 1321202001 - 2² = 1321201997 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1321202801) 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 15 ways as a sum of consecutive naturals, for example, 25896 + ... + 57558.

It is an arithmetic number, because the mean of its divisors is an integer number (125896064).

Almost surely, 2^1321202001 is an apocalyptic number.

It is an amenable number.

1321202001 is a deficient number, since it is larger than the sum of its proper divisors (693135023).

1321202001 is a wasteful number, since it uses less digits than its factorization.

1321202001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33660.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1321202001 is about 36348.3424794034. The cubic root of 1321202001 is about 1097.2941762865.

Adding to 1321202001 its reverse (1002021231), we get a palindrome (2323223232).

The spelling of 1321202001 in words is "one billion, three hundred twenty-one million, two hundred two thousand, one".