53307821 has 8 divisors (see below), whose sum is σ = 61043904. Its totient is φ = 45601920.

The previous prime is 53307803. The next prime is 53307827. The reversal of 53307821 is 12870335.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 53307821 - 2⁶ = 53307757 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 (53307827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3620 + ... + 10941.

It is an arithmetic number, because the mean of its divisors is an integer number (7630488).

Almost surely, 2^53307821 is an apocalyptic number.

It is an amenable number.

53307821 is a deficient number, since it is larger than the sum of its proper divisors (7736083).

53307821 is a wasteful number, since it uses less digits than its factorization.

53307821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15091.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 53307821 is about 7301.2205144072. The cubic root of 53307821 is about 376.3543819174.

The spelling of 53307821 in words is "fifty-three million, three hundred seven thousand, eight hundred twenty-one".