53215421 has 16 divisors (see below), whose sum is σ = 63398400. Its totient is φ = 44629200.

The previous prime is 53215411. The next prime is 53215433. The reversal of 53215421 is 12451235.

It is a de Polignac number, because none of the positive numbers 2^k-53215421 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 (53215411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14471 + ... + 17771.

It is an arithmetic number, because the mean of its divisors is an integer number (3962400).

Almost surely, 2^53215421 is an apocalyptic number.

It is an amenable number.

53215421 is a deficient number, since it is larger than the sum of its proper divisors (10182979).

53215421 is an equidigital number, since it uses as much as digits as its factorization.

53215421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3369 (or 3355 counting only the distinct ones).

The product of its digits is 1200, while the sum is 23.

The square root of 53215421 is about 7294.8900608577. The cubic root of 53215421 is about 376.1368074861.

Adding to 53215421 its reverse (12451235), we get a palindrome (65666656).

The spelling of 53215421 in words is "fifty-three million, two hundred fifteen thousand, four hundred twenty-one".