53211440 has 40 divisors (see below), whose sum is σ = 126741888. Its totient is φ = 20764160.

The previous prime is 53211413. The next prime is 53211449. The reversal of 53211440 is 4411235.

53211440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (53211449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4832 + ... + 11391.

Almost surely, 2^53211440 is an apocalyptic number.

It is an amenable number.

53211440 is an abundant number, since it is smaller than the sum of its proper divisors (73530448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

53211440 is a wasteful number, since it uses less digits than its factorization.

53211440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16277 (or 16271 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 53211440 is about 7294.6171935202. The cubic root of 53211440 is about 376.1274277616.

Adding to 53211440 its reverse (4411235), we get a palindrome (57622675).

The spelling of 53211440 in words is "fifty-three million, two hundred eleven thousand, four hundred forty".