20053221 has 8 divisors (see below), whose sum is σ = 26874144. Its totient is φ = 13300560.

The previous prime is 20053211. The next prime is 20053237. The reversal of 20053221 is 12235002.

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

It is not a de Polignac number, because 20053221 - 2¹⁵ = 20020453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20053221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20053211) 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, 16375 + ... + 17556.

It is an arithmetic number, because the mean of its divisors is an integer number (3359268).

Almost surely, 2^20053221 is an apocalyptic number.

It is an amenable number.

20053221 is a deficient number, since it is larger than the sum of its proper divisors (6820923).

20053221 is a wasteful number, since it uses less digits than its factorization.

20053221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34131.

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

The square root of 20053221 is about 4478.0822904453. The cubic root of 20053221 is about 271.6823217713.

Adding to 20053221 its reverse (12235002), we get a palindrome (32288223).

The spelling of 20053221 in words is "twenty million, fifty-three thousand, two hundred twenty-one".