53020221 has 8 divisors (see below), whose sum is σ = 73767360. Its totient is φ = 33809952.

The previous prime is 53020217. The next prime is 53020271. The reversal of 53020221 is 12202035.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 53020221 - 2² = 53020217 is a prime.

It is a super-2 number, since 2×53020221² = 5622287669777682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 53020221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53020211) 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, 384136 + ... + 384273.

It is an arithmetic number, because the mean of its divisors is an integer number (9220920).

Almost surely, 2^53020221 is an apocalyptic number.

It is an amenable number.

53020221 is a deficient number, since it is larger than the sum of its proper divisors (20747139).

53020221 is a wasteful number, since it uses less digits than its factorization.

53020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768435.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 53020221 is about 7281.4985408225. The cubic root of 53020221 is about 375.6763403256.

Adding to 53020221 its reverse (12202035), we get a palindrome (65222256).

The spelling of 53020221 in words is "fifty-three million, twenty thousand, two hundred twenty-one".