2020021101221 has 4 divisors (see below), whose sum is σ = 2026393407852. Its totient is φ = 2013648794592.

The previous prime is 2020021101209. The next prime is 2020021101277. The reversal of 2020021101221 is 1221011200202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 494931948196 + 1525089153025 = 703514^2 + 1234945^2 .

It is a cyclic number.

It is not a de Polignac number, because 2020021101221 - 2¹⁸ = 2020020839077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2020021101196 and 2020021101205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2020021901221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3186152840 + ... + 3186153473.

It is an arithmetic number, because the mean of its divisors is an integer number (506598351963).

Almost surely, 2^{2020021101221} is an apocalyptic number.

It is an amenable number.

2020021101221 is a deficient number, since it is larger than the sum of its proper divisors (6372306631).

2020021101221 is an equidigital number, since it uses as much as digits as its factorization.

2020021101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6372306630.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2020021101221 its reverse (1221011200202), we get a palindrome (3241032301423).

The spelling of 2020021101221 in words is "two trillion, twenty billion, twenty-one million, one hundred one thousand, two hundred twenty-one".