20113221 has 8 divisors (see below), whose sum is σ = 26840160. Its totient is φ = 13397552.

The previous prime is 20113217. The next prime is 20113231. The reversal of 20113221 is 12231102.

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

It is a cyclic number.

It is not a de Polignac number, because 20113221 - 2² = 20113217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20113197 and 20113206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20113231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3166 + ... + 7088.

It is an arithmetic number, because the mean of its divisors is an integer number (3355020).

Almost surely, 2^20113221 is an apocalyptic number.

It is an amenable number.

20113221 is a deficient number, since it is larger than the sum of its proper divisors (6726939).

20113221 is a wasteful number, since it uses less digits than its factorization.

20113221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5635.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 20113221 is about 4484.7765830641. The cubic root of 20113221 is about 271.9530132577.

Adding to 20113221 its reverse (12231102), we get a palindrome (32344323).

The spelling of 20113221 in words is "twenty million, one hundred thirteen thousand, two hundred twenty-one".