621053440105121 has 2 divisors, whose sum is σ = 621053440105122. Its totient is φ = 621053440105120.

The previous prime is 621053440105093. The next prime is 621053440105129. The reversal of 621053440105121 is 121501044350126.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 514471354805521 + 106582085299600 = 22681961^2 + 10323860^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621053440105121 is a prime.

It is not a weakly prime, because it can be changed into another prime (621053440105129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310526720052560 + 310526720052561.

It is an arithmetic number, because the mean of its divisors is an integer number (310526720052561).

Almost surely, 2^{621053440105121} is an apocalyptic number.

It is an amenable number.

621053440105121 is a deficient number, since it is larger than the sum of its proper divisors (1).

621053440105121 is an equidigital number, since it uses as much as digits as its factorization.

621053440105121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 35.

Adding to 621053440105121 its reverse (121501044350126), we get a palindrome (742554484455247).

The spelling of 621053440105121 in words is "six hundred twenty-one trillion, fifty-three billion, four hundred forty million, one hundred five thousand, one hundred twenty-one".