1321202031001 has 4 divisors (see below), whose sum is σ = 1321233670692. Its totient is φ = 1321170391312.

The previous prime is 1321202030999. The next prime is 1321202031043. The reversal of 1321202031001 is 1001302021231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 503532160000 + 817669871001 = 709600^2 + 904251^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321202031001 - 2¹ = 1321202030999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321202031101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15757126 + ... + 15840751.

It is an arithmetic number, because the mean of its divisors is an integer number (330308417673).

Almost surely, 2^{1321202031001} is an apocalyptic number.

It is an amenable number.

1321202031001 is a deficient number, since it is larger than the sum of its proper divisors (31639691).

1321202031001 is an equidigital number, since it uses as much as digits as its factorization.

1321202031001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31639690.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 1321202031001 its reverse (1001302021231), we get a palindrome (2322504052232).

The spelling of 1321202031001 in words is "one trillion, three hundred twenty-one billion, two hundred two million, thirty-one thousand, one".