2102022222221 has 4 divisors (see below), whose sum is σ = 2225670588252. Its totient is φ = 1978373856192.

The previous prime is 2102022222217. The next prime is 2102022222227. The reversal of 2102022222221 is 1222222202012.

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 1386282534025 + 715739688196 = 1177405^2 + 846014^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102022222221 - 2² = 2102022222217 is a prime.

It is a super-3 number, since 3×2102022222221³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2102022222193 and 2102022222202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102022222227) 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, 61824182990 + ... + 61824183023.

It is an arithmetic number, because the mean of its divisors is an integer number (556417647063).

Almost surely, 2^{2102022222221} is an apocalyptic number.

It is an amenable number.

2102022222221 is a deficient number, since it is larger than the sum of its proper divisors (123648366031).

2102022222221 is a wasteful number, since it uses less digits than its factorization.

2102022222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123648366030.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 2102022222221 its reverse (1222222202012), we get a palindrome (3324244424233).

The spelling of 2102022222221 in words is "two trillion, one hundred two billion, twenty-two million, two hundred twenty-two thousand, two hundred twenty-one".