53305621 has 6 divisors (see below), whose sum is σ = 56259222. Its totient is φ = 50499720.

The previous prime is 53305619. The next prime is 53305657. The reversal of 53305621 is 12650335.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 52403121 + 902500 = 7239^2 + 950^2 .

It is not a de Polignac number, because 53305621 - 2¹ = 53305619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53305321) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73470 + ... + 74191.

It is an arithmetic number, because the mean of its divisors is an integer number (9376537).

Almost surely, 2^53305621 is an apocalyptic number.

It is an amenable number.

53305621 is a deficient number, since it is larger than the sum of its proper divisors (2953601).

53305621 is a wasteful number, since it uses less digits than its factorization.

53305621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147699 (or 147680 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 53305621 is about 7301.0698531106. The cubic root of 53305621 is about 376.3492044968.

Adding to 53305621 its reverse (12650335), we get a palindrome (65955956).

The spelling of 53305621 in words is "fifty-three million, three hundred five thousand, six hundred twenty-one".