7731553122421 has 2 divisors, whose sum is σ = 7731553122422. Its totient is φ = 7731553122420.

The previous prime is 7731553122413. The next prime is 7731553122463. The reversal of 7731553122421 is 1242213551377.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5373749878225 + 2357803244196 = 2318135^2 + 1535514^2 .

It is a cyclic number.

It is not a de Polignac number, because 7731553122421 - 2³ = 7731553122413 is a prime.

It is a super-2 number, since 2×7731553122421² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7731553122481) 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 as a sum of consecutive naturals, namely, 3865776561210 + 3865776561211.

It is an arithmetic number, because the mean of its divisors is an integer number (3865776561211).

Almost surely, 2^{7731553122421} is an apocalyptic number.

It is an amenable number.

7731553122421 is a deficient number, since it is larger than the sum of its proper divisors (1).

7731553122421 is an equidigital number, since it uses as much as digits as its factorization.

7731553122421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 352800, while the sum is 43.

Adding to 7731553122421 its reverse (1242213551377), we get a palindrome (8973766673798).

The spelling of 7731553122421 in words is "seven trillion, seven hundred thirty-one billion, five hundred fifty-three million, one hundred twenty-two thousand, four hundred twenty-one".