2021202121221 has 16 divisors (see below), whose sum is σ = 3009420624000. Its totient is φ = 1340696880864.

The previous prime is 2021202121219. The next prime is 2021202121223. The reversal of 2021202121221 is 1221212021202.

It is a happy number.

2021202121221 is a `hidden beast` number, since 20 + 212 + 0 + 212 + 1 + 221 = 666.

It is an interprime number because it is at equal distance from previous prime (2021202121219) and next prime (2021202121223).

It is not a de Polignac number, because 2021202121221 - 2¹ = 2021202121219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021202121194 and 2021202121203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021202121223) 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 15 ways as a sum of consecutive naturals, for example, 188083416 + ... + 188094161.

It is an arithmetic number, because the mean of its divisors is an integer number (188088789000).

Almost surely, 2^{2021202121221} is an apocalyptic number.

It is an amenable number.

2021202121221 is a deficient number, since it is larger than the sum of its proper divisors (988218502779).

2021202121221 is a wasteful number, since it uses less digits than its factorization.

2021202121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376177785 (or 376177779 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 2021202121221 its reverse (1221212021202), we get a palindrome (3242414142423).

The spelling of 2021202121221 in words is "two trillion, twenty-one billion, two hundred two million, one hundred twenty-one thousand, two hundred twenty-one".