551021535121 has 2 divisors, whose sum is σ = 551021535122. Its totient is φ = 551021535120.

The previous prime is 551021535107. The next prime is 551021535149. The reversal of 551021535121 is 121535120155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 355586808721 + 195434726400 = 596311^2 + 442080^2 .

It is a cyclic number.

It is not a de Polignac number, because 551021535121 - 2⁷ = 551021534993 is a prime.

It is not a weakly prime, because it can be changed into another prime (551021535101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275510767560 + 275510767561.

It is an arithmetic number, because the mean of its divisors is an integer number (275510767561).

Almost surely, 2^551021535121 is an apocalyptic number.

It is an amenable number.

551021535121 is a deficient number, since it is larger than the sum of its proper divisors (1).

551021535121 is an equidigital number, since it uses as much as digits as its factorization.

551021535121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7500, while the sum is 31.

Adding to 551021535121 its reverse (121535120155), we get a palindrome (672556655276).

The spelling of 551021535121 in words is "five hundred fifty-one billion, twenty-one million, five hundred thirty-five thousand, one hundred twenty-one".