20220001221 has 64 divisors (see below), whose sum is σ = 31988348928. Its totient is φ = 11122645248.

The previous prime is 20220001213. The next prime is 20220001223. The reversal of 20220001221 is 12210002202.

It is not a de Polignac number, because 20220001221 - 2³ = 20220001213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20220001197 and 20220001206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20220001223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 29604346 + ... + 29605028.

It is an arithmetic number, because the mean of its divisors is an integer number (499817952).

Almost surely, 2^20220001221 is an apocalyptic number.

20220001221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20220001221 is a deficient number, since it is larger than the sum of its proper divisors (11768347707).

20220001221 is a wasteful number, since it uses less digits than its factorization.

20220001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1210.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 20220001221 its reverse (12210002202), we get a palindrome (32430003423).

The spelling of 20220001221 in words is "twenty billion, two hundred twenty million, one thousand, two hundred twenty-one".