20211232221 has 24 divisors (see below), whose sum is σ = 32255271360. Its totient is φ = 12130183296.

The previous prime is 20211232193. The next prime is 20211232229. The reversal of 20211232221 is 12223211202.

20211232221 is a `hidden beast` number, since 2 + 0 + 211 + 232 + 221 = 666.

It is not a de Polignac number, because 20211232221 - 2¹⁰ = 20211231197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20211232194 and 20211232203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211232229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2868211 + ... + 2875248.

It is an arithmetic number, because the mean of its divisors is an integer number (1343969640).

Almost surely, 2^20211232221 is an apocalyptic number.

It is an amenable number.

20211232221 is a deficient number, since it is larger than the sum of its proper divisors (12044039139).

20211232221 is a wasteful number, since it uses less digits than its factorization.

20211232221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5743505 (or 5743502 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 20211232221 its reverse (12223211202), we get a palindrome (32434443423).

The spelling of 20211232221 in words is "twenty billion, two hundred eleven million, two hundred thirty-two thousand, two hundred twenty-one".