2020220021221 has 8 divisors (see below), whose sum is σ = 2039233012344. Its totient is φ = 2001291345600.

The previous prime is 2020220021201. The next prime is 2020220021251. The reversal of 2020220021221 is 1221200220202.

It can be written as a sum of positive squares in 4 ways, for example, as 358735113025 + 1661484908196 = 598945^2 + 1288986^2 .

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 2020220021221 - 2⁵ = 2020220021189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2020220021195 and 2020220021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2020220021201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21030730 + ... + 21126571.

It is an arithmetic number, because the mean of its divisors is an integer number (254904126543).

Almost surely, 2^{2020220021221} is an apocalyptic number.

It is an amenable number.

2020220021221 is a deficient number, since it is larger than the sum of its proper divisors (19012991123).

2020220021221 is a wasteful number, since it uses less digits than its factorization.

2020220021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42157751.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 2020220021221 its reverse (1221200220202), we get a palindrome (3241420241423).

The spelling of 2020220021221 in words is "two trillion, twenty billion, two hundred twenty million, twenty-one thousand, two hundred twenty-one".