53407321 has 4 divisors (see below), whose sum is σ = 58262544. Its totient is φ = 48552100.

The previous prime is 53407307. The next prime is 53407339. The reversal of 53407321 is 12370435.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 53407321 - 2²³ = 45018713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53407381) 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, 2427595 + ... + 2427616.

It is an arithmetic number, because the mean of its divisors is an integer number (14565636).

Almost surely, 2^53407321 is an apocalyptic number.

It is an amenable number.

53407321 is a deficient number, since it is larger than the sum of its proper divisors (4855223).

53407321 is a wasteful number, since it uses less digits than its factorization.

53407321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4855222.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 53407321 is about 7308.0312670377. The cubic root of 53407321 is about 376.5883937739.

Adding to 53407321 its reverse (12370435), we get a palindrome (65777756).

The spelling of 53407321 in words is "fifty-three million, four hundred seven thousand, three hundred twenty-one".