55317233202421 has 2 divisors, whose sum is σ = 55317233202422. Its totient is φ = 55317233202420.

The previous prime is 55317233202419. The next prime is 55317233202449. The reversal of 55317233202421 is 12420233271355.

55317233202421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31865054067396 + 23452179135025 = 5644914^2 + 4842745^2 .

It is a cyclic number.

It is not a de Polignac number, because 55317233202421 - 2¹ = 55317233202419 is a prime.

It is a super-2 number, since 2×55317233202421² (a number of 28 digits) contains 22 as substring.

Together with 55317233202419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55317233202481) 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, 27658616601210 + 27658616601211.

It is an arithmetic number, because the mean of its divisors is an integer number (27658616601211).

Almost surely, 2^{55317233202421} is an apocalyptic number.

It is an amenable number.

55317233202421 is a deficient number, since it is larger than the sum of its proper divisors (1).

55317233202421 is an equidigital number, since it uses as much as digits as its factorization.

55317233202421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 302400, while the sum is 40.

Adding to 55317233202421 its reverse (12420233271355), we get a palindrome (67737466473776).

The spelling of 55317233202421 in words is "fifty-five trillion, three hundred seventeen billion, two hundred thirty-three million, two hundred two thousand, four hundred twenty-one".