2021212201221 has 12 divisors (see below), whose sum is σ = 2969012273760. Its totient is φ = 1324636244520.

The previous prime is 2021212201121. The next prime is 2021212201243. The reversal of 2021212201221 is 1221022121202.

It is a happy number.

2021212201221 is a `hidden beast` number, since 20 + 212 + 12 + 201 + 221 = 666.

It is not a de Polignac number, because 2021212201221 - 2¹⁷ = 2021212070149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021212201194 and 2021212201203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021212201271) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1903212465 + ... + 1903213526.

It is an arithmetic number, because the mean of its divisors is an integer number (247417689480).

Almost surely, 2^{2021212201221} is an apocalyptic number.

It is an amenable number.

2021212201221 is a deficient number, since it is larger than the sum of its proper divisors (947800072539).

2021212201221 is a wasteful number, since it uses less digits than its factorization.

2021212201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3806426056 (or 3806426053 counting only the distinct ones).

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

Adding to 2021212201221 its reverse (1221022121202), we get a palindrome (3242234322423).

The spelling of 2021212201221 in words is "two trillion, twenty-one billion, two hundred twelve million, two hundred one thousand, two hundred twenty-one".