53123321 has 4 divisors (see below), whose sum is σ = 53145444. Its totient is φ = 53101200.

The previous prime is 53123309. The next prime is 53123327. The reversal of 53123321 is 12332135.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12332135 = 5 ⋅2466427.

It can be written as a sum of positive squares in 2 ways, for example, as 28729600 + 24393721 = 5360^2 + 4939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53123321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 53123293 and 53123302.

It is not an unprimeable number, because it can be changed into a prime (53123327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6950 + ... + 12431.

It is an arithmetic number, because the mean of its divisors is an integer number (13286361).

Almost surely, 2^53123321 is an apocalyptic number.

It is an amenable number.

53123321 is a deficient number, since it is larger than the sum of its proper divisors (22123).

53123321 is a wasteful number, since it uses less digits than its factorization.

53123321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22122.

The product of its digits is 540, while the sum is 20.

The square root of 53123321 is about 7288.5746891968. The cubic root of 53123321 is about 375.9196886907.

Adding to 53123321 its reverse (12332135), we get a palindrome (65455456).

The spelling of 53123321 in words is "fifty-three million, one hundred twenty-three thousand, three hundred twenty-one".