53021321 has 4 divisors (see below), whose sum is σ = 53812752. Its totient is φ = 52229892.

The previous prime is 53021303. The next prime is 53021327. The reversal of 53021321 is 12312035.

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 a de Polignac number, because none of the positive numbers 2^k-53021321 is a prime.

It is a super-2 number, since 2×53021321² = 5622520961170082, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 53021321.

It is not an unprimeable number, because it can be changed into a prime (53021327) 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, 395615 + ... + 395748.

It is an arithmetic number, because the mean of its divisors is an integer number (13453188).

Almost surely, 2^53021321 is an apocalyptic number.

It is an amenable number.

53021321 is a deficient number, since it is larger than the sum of its proper divisors (791431).

53021321 is an equidigital number, since it uses as much as digits as its factorization.

53021321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791430.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 53021321 is about 7281.5740743331. The cubic root of 53021321 is about 375.6789383351.

Adding to 53021321 its reverse (12312035), we get a palindrome (65333356).

The spelling of 53021321 in words is "fifty-three million, twenty-one thousand, three hundred twenty-one".