20200021221 has 8 divisors (see below), whose sum is σ = 26988668224. Its totient is φ = 13439027520.

The previous prime is 20200021213. The next prime is 20200021223. The reversal of 20200021221 is 12212000202.

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

It is not a de Polignac number, because 20200021221 - 2³ = 20200021213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20200021197 and 20200021206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20200021223) 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, 6911620 + ... + 6914541.

It is an arithmetic number, because the mean of its divisors is an integer number (3373583528).

Almost surely, 2^20200021221 is an apocalyptic number.

It is an amenable number.

20200021221 is a deficient number, since it is larger than the sum of its proper divisors (6788647003).

20200021221 is a wasteful number, since it uses less digits than its factorization.

20200021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13826651.

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

Adding to 20200021221 its reverse (12212000202), we get a palindrome (32412021423).

The spelling of 20200021221 in words is "twenty billion, two hundred million, twenty-one thousand, two hundred twenty-one".