2121202222221 has 8 divisors (see below), whose sum is σ = 2828569876384. Its totient is φ = 1413984691440.

The previous prime is 2121202222201. The next prime is 2121202222273. The reversal of 2121202222221 is 1222222021212.

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

It is not a de Polignac number, because 2121202222221 - 2¹⁸ = 2121201960077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121202222201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37497871 + ... + 37554396.

It is an arithmetic number, because the mean of its divisors is an integer number (353571234548).

Almost surely, 2^{2121202222221} is an apocalyptic number.

It is an amenable number.

2121202222221 is a deficient number, since it is larger than the sum of its proper divisors (707367654163).

2121202222221 is an equidigital number, since it uses as much as digits as its factorization.

2121202222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75061691.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 2121202222221 its reverse (1222222021212), we get a palindrome (3343424243433).

The spelling of 2121202222221 in words is "two trillion, one hundred twenty-one billion, two hundred two million, two hundred twenty-two thousand, two hundred twenty-one".