20230221 has 16 divisors (see below), whose sum is σ = 31157568. Its totient is φ = 11539200.

The previous prime is 20230219. The next prime is 20230237. The reversal of 20230221 is 12203202.

It is not a de Polignac number, because 20230221 - 2¹ = 20230219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20230197 and 20230206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20230201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17470 + ... + 18591.

It is an arithmetic number, because the mean of its divisors is an integer number (1947348).

Almost surely, 2^20230221 is an apocalyptic number.

It is an amenable number.

20230221 is a deficient number, since it is larger than the sum of its proper divisors (10927347).

20230221 is a wasteful number, since it uses less digits than its factorization.

20230221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36092.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 20230221 is about 4497.8017964335. The cubic root of 20230221 is about 272.4793172305.

Adding to 20230221 its reverse (12203202), we get a palindrome (32433423).

The spelling of 20230221 in words is "twenty million, two hundred thirty thousand, two hundred twenty-one".