53021340 has 36 divisors (see below), whose sum is σ = 160831944. Its totient is φ = 14138976.

The previous prime is 53021327. The next prime is 53021363. The reversal of 53021340 is 4312035.

53021340 is a `hidden beast` number, since 530 + 2 + 134 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×53021340² = 5622524990791200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 147102 + ... + 147461.

It is an arithmetic number, because the mean of its divisors is an integer number (4467554).

Almost surely, 2^53021340 is an apocalyptic number.

It is an amenable number.

53021340 is an abundant number, since it is smaller than the sum of its proper divisors (107810604).

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

53021340 is a wasteful number, since it uses less digits than its factorization.

53021340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294578 (or 294573 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 53021340 is about 7281.5753789959. The cubic root of 53021340 is about 375.6789832095.

Adding to 53021340 its reverse (4312035), we get a palindrome (57333375).

It can be divided in two parts, 53021 and 340, that added together give a square (53361 = 231²).

The spelling of 53021340 in words is "fifty-three million, twenty-one thousand, three hundred forty".