531020242021121 has 4 divisors (see below), whose sum is σ = 531054323305044. Its totient is φ = 530986160737200.

The previous prime is 531020242021109. The next prime is 531020242021123. The reversal of 531020242021121 is 121120242020135.

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 286713620064400 + 244306621956721 = 16932620^2 + 15630311^2 .

It is a cyclic number.

It is not a de Polignac number, because 531020242021121 - 2²² = 531020237826817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (531020242021123) 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, 17040618590 + ... + 17040649751.

It is an arithmetic number, because the mean of its divisors is an integer number (132763580826261).

Almost surely, 2^{531020242021121} is an apocalyptic number.

It is an amenable number.

531020242021121 is a deficient number, since it is larger than the sum of its proper divisors (34081283923).

531020242021121 is a wasteful number, since it uses less digits than its factorization.

531020242021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34081283922.

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 531020242021121 its reverse (121120242020135), we get a palindrome (652140484041256).

The spelling of 531020242021121 in words is "five hundred thirty-one trillion, twenty billion, two hundred forty-two million, twenty-one thousand, one hundred twenty-one".