53021505 has 16 divisors (see below), whose sum is σ = 86226624. Its totient is φ = 27814080.

The previous prime is 53021503. The next prime is 53021513. The reversal of 53021505 is 50512035.

It is not a de Polignac number, because 53021505 - 2¹ = 53021503 is a prime.

It is a super-2 number, since 2×53021505² = 5622559984930050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (53021503) 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, 28059 + ... + 29888.

It is an arithmetic number, because the mean of its divisors is an integer number (5389164).

Almost surely, 2^53021505 is an apocalyptic number.

It is an amenable number.

53021505 is a deficient number, since it is larger than the sum of its proper divisors (33205119).

53021505 is a wasteful number, since it uses less digits than its factorization.

53021505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58016.

The product of its (nonzero) digits is 750, while the sum is 21.

The square root of 53021505 is about 7281.5867089529. The cubic root of 53021505 is about 375.6793729077.

The spelling of 53021505 in words is "fifty-three million, twenty-one thousand, five hundred five".