20021233221 has 24 divisors (see below), whose sum is σ = 31592119104. Its totient is φ = 12117346560.

The previous prime is 20021233213. The next prime is 20021233231. The reversal of 20021233221 is 12233212002.

20021233221 is a `hidden beast` number, since 200 + 212 + 33 + 221 = 666.

It is not a de Polignac number, because 20021233221 - 2³ = 20021233213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20021233194 and 20021233203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021233231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67116 + ... + 211061.

It is an arithmetic number, because the mean of its divisors is an integer number (1316338296).

Almost surely, 2^20021233221 is an apocalyptic number.

It is an amenable number.

20021233221 is a deficient number, since it is larger than the sum of its proper divisors (11570885883).

20021233221 is a wasteful number, since it uses less digits than its factorization.

20021233221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278921 (or 278918 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 20021233221 its reverse (12233212002), we get a palindrome (32254445223).

The spelling of 20021233221 in words is "twenty billion, twenty-one million, two hundred thirty-three thousand, two hundred twenty-one".