1320203265401 has 4 divisors (see below), whose sum is σ = 1320205612404. Its totient is φ = 1320200918400.

The previous prime is 1320203265397. The next prime is 1320203265439. The reversal of 1320203265401 is 1045623020231.

It is a happy number.

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 518284806400 + 801918459001 = 719920^2 + 895499^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320203265401 - 2² = 1320203265397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1320203265461) 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, 228941 + ... + 1640981.

It is an arithmetic number, because the mean of its divisors is an integer number (330051403101).

Almost surely, 2^{1320203265401} is an apocalyptic number.

It is an amenable number.

1320203265401 is a deficient number, since it is larger than the sum of its proper divisors (2347003).

1320203265401 is an equidigital number, since it uses as much as digits as its factorization.

1320203265401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2347002.

The product of its (nonzero) digits is 8640, while the sum is 29.

Adding to 1320203265401 its reverse (1045623020231), we get a palindrome (2365826285632).

The spelling of 1320203265401 in words is "one trillion, three hundred twenty billion, two hundred three million, two hundred sixty-five thousand, four hundred one".