53005621 has 2 divisors, whose sum is σ = 53005622. Its totient is φ = 53005620.

The previous prime is 53005577. The next prime is 53005651. The reversal of 53005621 is 12650035.

53005621 = T₅₉₄₃ + T₅₉₄₄ + T₅₉₄₅.

It is a happy number.

53005621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39828721 + 13176900 = 6311^2 + 3630^2 .

It is a cyclic number.

It is not a de Polignac number, because 53005621 - 2⁷ = 53005493 is a prime.

It is equal to p_3170362 and since 53005621 and 3170362 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 53005592 and 53005601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53005651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26502810 + 26502811.

It is an arithmetic number, because the mean of its divisors is an integer number (26502811).

Almost surely, 2^53005621 is an apocalyptic number.

53005621 is the 5945-th centered triangular number.

It is an amenable number.

53005621 is a deficient number, since it is larger than the sum of its proper divisors (1).

53005621 is an equidigital number, since it uses as much as digits as its factorization.

53005621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 53005621 is about 7280.4959309102. The cubic root of 53005621 is about 375.6418542497.

Adding to 53005621 its reverse (12650035), we get a palindrome (65655656).

The spelling of 53005621 in words is "fifty-three million, five thousand, six hundred twenty-one".