2021210201221 has 8 divisors (see below), whose sum is σ = 2036006832600. Its totient is φ = 2006414197248.

The previous prime is 2021210201191. The next prime is 2021210201233. The reversal of 2021210201221 is 1221020121202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1386023517025 + 635186684196 = 1177295^2 + 796986^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-2021210201221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021210201195 and 2021210201204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021210201921) 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, 7769955 + ... + 8025871.

It is an arithmetic number, because the mean of its divisors is an integer number (254500854075).

Almost surely, 2^{2021210201221} is an apocalyptic number.

It is an amenable number.

2021210201221 is a deficient number, since it is larger than the sum of its proper divisors (14796631379).

2021210201221 is a wasteful number, since it uses less digits than its factorization.

2021210201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313703.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2021210201221 its reverse (1221020121202), we get a palindrome (3242230322423).

The spelling of 2021210201221 in words is "two trillion, twenty-one billion, two hundred ten million, two hundred one thousand, two hundred twenty-one".