20323220221 has 16 divisors (see below), whose sum is σ = 20857841280. Its totient is φ = 19796071680.

The previous prime is 20323220189. The next prime is 20323220243. The reversal of 20323220221 is 12202232302.

It is a cyclic number.

It is not a de Polignac number, because 20323220221 - 2⁵ = 20323220189 is a prime.

It is a super-3 number, since 3×20323220221³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20323220261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8386416 + ... + 8388838.

It is an arithmetic number, because the mean of its divisors is an integer number (1303615080).

Almost surely, 2^20323220221 is an apocalyptic number.

It is an amenable number.

20323220221 is a deficient number, since it is larger than the sum of its proper divisors (534621059).

20323220221 is a wasteful number, since it uses less digits than its factorization.

20323220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3876.

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 20323220221 its reverse (12202232302), we get a palindrome (32525452523).

The spelling of 20323220221 in words is "twenty billion, three hundred twenty-three million, two hundred twenty thousand, two hundred twenty-one".