53021620 has 24 divisors (see below), whose sum is σ = 111621888. Its totient is φ = 21156000.

The previous prime is 53021587. The next prime is 53021621. The reversal of 53021620 is 2612035.

It is a happy number.

It is a super-2 number, since 2×53021620² = 5622584374848800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53021621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5545 + ... + 11695.

It is an arithmetic number, because the mean of its divisors is an integer number (4650912).

Almost surely, 2^53021620 is an apocalyptic number.

It is an amenable number.

53021620 is an abundant number, since it is smaller than the sum of its proper divisors (58600268).

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

53021620 is a wasteful number, since it uses less digits than its factorization.

53021620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6591 (or 6589 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 53021620 is about 7281.5946055792. The cubic root of 53021620 is about 375.6796445151.

Adding to 53021620 its reverse (2612035), we get a palindrome (55633655).

The spelling of 53021620 in words is "fifty-three million, twenty-one thousand, six hundred twenty".