551340021521 has 2 divisors, whose sum is σ = 551340021522. Its totient is φ = 551340021520.

The previous prime is 551340021497. The next prime is 551340021563. The reversal of 551340021521 is 125120043155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 505327626496 + 46012395025 = 710864^2 + 214505^2 .

It is a cyclic number.

It is not a de Polignac number, because 551340021521 - 2¹⁴ = 551340005137 is a prime.

It is not a weakly prime, because it can be changed into another prime (551340021121) 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 as a sum of consecutive naturals, namely, 275670010760 + 275670010761.

It is an arithmetic number, because the mean of its divisors is an integer number (275670010761).

Almost surely, 2^551340021521 is an apocalyptic number.

It is an amenable number.

551340021521 is a deficient number, since it is larger than the sum of its proper divisors (1).

551340021521 is an equidigital number, since it uses as much as digits as its factorization.

551340021521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6000, while the sum is 29.

Adding to 551340021521 its reverse (125120043155), we get a palindrome (676460064676).

The spelling of 551340021521 in words is "five hundred fifty-one billion, three hundred forty million, twenty-one thousand, five hundred twenty-one".