20220021221 has 8 divisors (see below), whose sum is σ = 21464478360. Its totient is φ = 18981680128.

The previous prime is 20220021167. The next prime is 20220021271. The reversal of 20220021221 is 12212002202.

It can be written as a sum of positive squares in 4 ways, for example, as 335073025 + 19884948196 = 18305^2 + 141014^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20220021221 - 2¹⁴ = 20220004837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20220021196 and 20220021205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20220021271) 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 7 ways as a sum of consecutive naturals, for example, 1522196 + ... + 1535421.

It is an arithmetic number, because the mean of its divisors is an integer number (2683059795).

Almost surely, 2^20220021221 is an apocalyptic number.

It is an amenable number.

20220021221 is a deficient number, since it is larger than the sum of its proper divisors (1244457139).

20220021221 is a wasteful number, since it uses less digits than its factorization.

20220021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3058023.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 20220021221 its reverse (12212002202), we get a palindrome (32432023423).

The spelling of 20220021221 in words is "twenty billion, two hundred twenty million, twenty-one thousand, two hundred twenty-one".