53328921 has 8 divisors (see below), whose sum is σ = 71648544. Its totient is φ = 35280960.

The previous prime is 53328917. The next prime is 53328943. The reversal of 53328921 is 12982335.

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

It is not a de Polignac number, because 53328921 - 2² = 53328917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (53328521) 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, 67456 + ... + 68241.

It is an arithmetic number, because the mean of its divisors is an integer number (8956068).

Almost surely, 2^53328921 is an apocalyptic number.

It is an amenable number.

53328921 is a deficient number, since it is larger than the sum of its proper divisors (18319623).

53328921 is a wasteful number, since it uses less digits than its factorization.

53328921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135831.

The product of its digits is 12960, while the sum is 33.

The square root of 53328921 is about 7302.6653353416. The cubic root of 53328921 is about 376.4040308545.

The spelling of 53328921 in words is "fifty-three million, three hundred twenty-eight thousand, nine hundred twenty-one".