55224121 has 2 divisors, whose sum is σ = 55224122. Its totient is φ = 55224120.

The previous prime is 55224119. The next prime is 55224161. The reversal of 55224121 is 12142255.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29822521 + 25401600 = 5461^2 + 5040^2 .

It is a cyclic number.

It is not a de Polignac number, because 55224121 - 2¹ = 55224119 is a prime.

Together with 55224119, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 55224092 and 55224101.

It is not a weakly prime, because it can be changed into another prime (55224101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27612060 + 27612061.

It is an arithmetic number, because the mean of its divisors is an integer number (27612061).

Almost surely, 2^55224121 is an apocalyptic number.

It is an amenable number.

55224121 is a deficient number, since it is larger than the sum of its proper divisors (1).

55224121 is an equidigital number, since it uses as much as digits as its factorization.

55224121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 800, while the sum is 22.

The square root of 55224121 is about 7431.2933598399. The cubic root of 55224121 is about 380.8111045041.

Adding to 55224121 its reverse (12142255), we get a palindrome (67366376).

The spelling of 55224121 in words is "fifty-five million, two hundred twenty-four thousand, one hundred twenty-one".