53140821 has 16 divisors (see below), whose sum is σ = 73388160. Its totient is φ = 34182720.

The previous prime is 53140757. The next prime is 53140837. The reversal of 53140821 is 12804135.

53140821 = T₂₁₃ + T₂₁₄ + ... + T₆₈₉.

It is not a de Polignac number, because 53140821 - 2⁶ = 53140757 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 53140791 and 53140800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53140121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6960 + ... + 12438.

It is an arithmetic number, because the mean of its divisors is an integer number (4586760).

Almost surely, 2^53140821 is an apocalyptic number.

It is an amenable number.

53140821 is a deficient number, since it is larger than the sum of its proper divisors (20247339).

53140821 is a wasteful number, since it uses less digits than its factorization.

53140821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5596.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 53140821 is about 7289.7750994115. The cubic root of 53140821 is about 375.9609629195.

Adding to 53140821 its reverse (12804135), we get a palindrome (65944956).

The spelling of 53140821 in words is "fifty-three million, one hundred forty thousand, eight hundred twenty-one".