2031344420521 has 4 divisors (see below), whose sum is σ = 2187601683652. Its totient is φ = 1875087157392.

The previous prime is 2031344420519. The next prime is 2031344420549. The reversal of 2031344420521 is 1250244431302.

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 834781904896 + 1196562515625 = 913664^2 + 1093875^2 .

It is a cyclic number.

It is not a de Polignac number, because 2031344420521 - 2¹ = 2031344420519 is a prime.

It is a super-2 number, since 2×2031344420521² (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 (2031344421521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78128631546 + ... + 78128631571.

It is an arithmetic number, because the mean of its divisors is an integer number (546900420913).

Almost surely, 2^{2031344420521} is an apocalyptic number.

It is an amenable number.

2031344420521 is a deficient number, since it is larger than the sum of its proper divisors (156257263131).

2031344420521 is a wasteful number, since it uses less digits than its factorization.

2031344420521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156257263130.

The product of its (nonzero) digits is 23040, while the sum is 31.

Adding to 2031344420521 its reverse (1250244431302), we get a palindrome (3281588851823).

The spelling of 2031344420521 in words is "two trillion, thirty-one billion, three hundred forty-four million, four hundred twenty thousand, five hundred twenty-one".