1321450033553 has 16 divisors (see below), whose sum is σ = 1453096559376. Its totient is φ = 1194188586240.

The previous prime is 1321450033537. The next prime is 1321450033559. The reversal of 1321450033553 is 3553300541231.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 340534103809 + 980915929744 = 583553^2 + 990412^2 .

It is not a de Polignac number, because 1321450033553 - 2⁴ = 1321450033537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321450033559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1762550 + ... + 2397807.

It is an arithmetic number, because the mean of its divisors is an integer number (90818534961).

Almost surely, 2^{1321450033553} is an apocalyptic number.

1321450033553 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1321450033553 is a deficient number, since it is larger than the sum of its proper divisors (131646525823).

1321450033553 is a wasteful number, since it uses less digits than its factorization.

1321450033553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4160884.

The product of its (nonzero) digits is 81000, while the sum is 35.

Adding to 1321450033553 its reverse (3553300541231), we get a palindrome (4874750574784).

The spelling of 1321450033553 in words is "one trillion, three hundred twenty-one billion, four hundred fifty million, thirty-three thousand, five hundred fifty-three".