53235821 has 2 divisors, whose sum is σ = 53235822. Its totient is φ = 53235820.

The previous prime is 53235811. The next prime is 53235829. The reversal of 53235821 is 12853235.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33477796 + 19758025 = 5786^2 + 4445^2 .

It is a cyclic number.

It is not a de Polignac number, because 53235821 - 2⁶ = 53235757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53235829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26617910 + 26617911.

It is an arithmetic number, because the mean of its divisors is an integer number (26617911).

Almost surely, 2^53235821 is an apocalyptic number.

It is an amenable number.

53235821 is a deficient number, since it is larger than the sum of its proper divisors (1).

53235821 is an equidigital number, since it uses as much as digits as its factorization.

53235821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 29.

The square root of 53235821 is about 7296.2881659101. The cubic root of 53235821 is about 376.1848650506.

The spelling of 53235821 in words is "fifty-three million, two hundred thirty-five thousand, eight hundred twenty-one".