53020521 has 16 divisors (see below), whose sum is σ = 79009920. Its totient is φ = 35139600.

The previous prime is 53020493. The next prime is 53020523. The reversal of 53020521 is 12502035.

53020521 = 206² + 207² + ... + 551².

It is a happy number.

It is not a de Polignac number, because 53020521 - 2¹⁰ = 53019497 is a prime.

It is a super-2 number, since 2×53020521² = 5622351294222882, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 53020494 and 53020503.

It is not an unprimeable number, because it can be changed into a prime (53020523) 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, 1005 + ... + 10346.

It is an arithmetic number, because the mean of its divisors is an integer number (4938120).

Almost surely, 2^53020521 is an apocalyptic number.

It is an amenable number.

53020521 is a deficient number, since it is larger than the sum of its proper divisors (25989399).

53020521 is a wasteful number, since it uses less digits than its factorization.

53020521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11533 (or 11527 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 53020521 is about 7281.5191409485. The cubic root of 53020521 is about 375.6770488772.

Adding to 53020521 its reverse (12502035), we get a palindrome (65522556).

The spelling of 53020521 in words is "fifty-three million, twenty thousand, five hundred twenty-one".