1056531340321 has 16 divisors (see below), whose sum is σ = 1083461874768. Its totient is φ = 1029656857600.

The previous prime is 1056531340237. The next prime is 1056531340351. The reversal of 1056531340321 is 1230431356501.

It can be written as a sum of positive squares in 8 ways, for example, as 7004853025 + 1049526487296 = 83695^2 + 1024464^2 .

It is a cyclic number.

It is not a de Polignac number, because 1056531340321 - 2²³ = 1056522951713 is a prime.

It is a super-2 number, since 2×1056531340321² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1056531340351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 276504591 + ... + 276508411.

It is an arithmetic number, because the mean of its divisors is an integer number (67716367173).

Almost surely, 2^{1056531340321} is an apocalyptic number.

It is an amenable number.

1056531340321 is a deficient number, since it is larger than the sum of its proper divisors (26930534447).

1056531340321 is a wasteful number, since it uses less digits than its factorization.

1056531340321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9332.

The product of its (nonzero) digits is 32400, while the sum is 34.

Adding to 1056531340321 its reverse (1230431356501), we get a palindrome (2286962696822).

The spelling of 1056531340321 in words is "one trillion, fifty-six billion, five hundred thirty-one million, three hundred forty thousand, three hundred twenty-one".