53203621 has 2 divisors, whose sum is σ = 53203622. Its totient is φ = 53203620.

The previous prime is 53203613. The next prime is 53203639. The reversal of 53203621 is 12630235.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43375396 + 9828225 = 6586^2 + 3135^2 .

It is a cyclic number.

It is not a de Polignac number, because 53203621 - 2³ = 53203613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 53203592 and 53203601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53203681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26601810 + 26601811.

It is an arithmetic number, because the mean of its divisors is an integer number (26601811).

Almost surely, 2^53203621 is an apocalyptic number.

It is an amenable number.

53203621 is a deficient number, since it is larger than the sum of its proper divisors (1).

53203621 is an equidigital number, since it uses as much as digits as its factorization.

53203621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 53203621 is about 7294.0812306966. The cubic root of 53203621 is about 376.1090038761.

Adding to 53203621 its reverse (12630235), we get a palindrome (65833856).

It can be divided in two parts, 53203 and 621, that added together give a square (53824 = 232²).

The spelling of 53203621 in words is "fifty-three million, two hundred three thousand, six hundred twenty-one".