55424242421 has 2 divisors, whose sum is σ = 55424242422. Its totient is φ = 55424242420.

The previous prime is 55424242411. The next prime is 55424242483. The reversal of 55424242421 is 12424242455.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34045416196 + 21378826225 = 184514^2 + 146215^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55424242421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55424242411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27712121210 + 27712121211.

It is an arithmetic number, because the mean of its divisors is an integer number (27712121211).

Almost surely, 2^55424242421 is an apocalyptic number.

It is an amenable number.

55424242421 is a deficient number, since it is larger than the sum of its proper divisors (1).

55424242421 is an equidigital number, since it uses as much as digits as its factorization.

55424242421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 102400, while the sum is 35.

Adding to 55424242421 its reverse (12424242455), we get a palindrome (67848484876).

The spelling of 55424242421 in words is "fifty-five billion, four hundred twenty-four million, two hundred forty-two thousand, four hundred twenty-one".