20220221 has 8 divisors (see below), whose sum is σ = 23905920. Its totient is φ = 16733808.

The previous prime is 20220217. The next prime is 20220247. The reversal of 20220221 is 12202202.

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

It is not a de Polignac number, because 20220221 - 2² = 20220217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20220251) 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, 49601 + ... + 50006.

It is an arithmetic number, because the mean of its divisors is an integer number (2988240).

Almost surely, 2^20220221 is an apocalyptic number.

It is an amenable number.

20220221 is a deficient number, since it is larger than the sum of its proper divisors (3685699).

20220221 is an equidigital number, since it uses as much as digits as its factorization.

20220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99643.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 20220221 is about 4496.6900048814. The cubic root of 20220221 is about 272.4344134163.

Adding to 20220221 its reverse (12202202), we get a palindrome (32422423).

The spelling of 20220221 in words is "twenty million, two hundred twenty thousand, two hundred twenty-one".