55823021 has 2 divisors, whose sum is σ = 55823022. Its totient is φ = 55823020.

The previous prime is 55822967. The next prime is 55823041. The reversal of 55823021 is 12032855.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54967396 + 855625 = 7414^2 + 925^2 .

It is a cyclic number.

It is not a de Polignac number, because 55823021 - 2⁶ = 55822957 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55823041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27911510 + 27911511.

It is an arithmetic number, because the mean of its divisors is an integer number (27911511).

Almost surely, 2^55823021 is an apocalyptic number.

It is an amenable number.

55823021 is a deficient number, since it is larger than the sum of its proper divisors (1).

55823021 is an equidigital number, since it uses as much as digits as its factorization.

55823021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 55823021 is about 7471.4805092431. The cubic root of 55823021 is about 382.1827771281.

Adding to 55823021 its reverse (12032855), we get a palindrome (67855876).

The spelling of 55823021 in words is "fifty-five million, eight hundred twenty-three thousand, twenty-one".