1355431543021 has 8 divisors (see below), whose sum is σ = 1381452962040. Its totient is φ = 1329426688512.

The previous prime is 1355431542973. The next prime is 1355431543031. The reversal of 1355431543021 is 1203451345531.

It can be written as a sum of positive squares in 4 ways, for example, as 761106187396 + 594325355625 = 872414^2 + 770925^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1355431543021 - 2³³ = 1346841608429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1355431543031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3975840 + ... + 4303273.

It is an arithmetic number, because the mean of its divisors is an integer number (172681620255).

Almost surely, 2^{1355431543021} is an apocalyptic number.

It is an amenable number.

1355431543021 is a deficient number, since it is larger than the sum of its proper divisors (26021419019).

1355431543021 is an equidigital number, since it uses as much as digits as its factorization.

1355431543021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8282255.

The product of its (nonzero) digits is 108000, while the sum is 37.

Adding to 1355431543021 its reverse (1203451345531), we get a palindrome (2558882888552).

The spelling of 1355431543021 in words is "one trillion, three hundred fifty-five billion, four hundred thirty-one million, five hundred forty-three thousand, twenty-one".