2100222112221 has 6 divisors (see below), whose sum is σ = 3033654162110. Its totient is φ = 1400148074808.

The previous prime is 2100222112141. The next prime is 2100222112223. The reversal of 2100222112221 is 1222112220012.

It is a happy number.

2100222112221 is a `hidden beast` number, since 210 + 0 + 2 + 221 + 12 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1946569088025 + 153653024196 = 1395195^2 + 391986^2 .

It is not a de Polignac number, because 2100222112221 - 2⁹ = 2100222111709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100222112194 and 2100222112203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100222112223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 116679006226 + ... + 116679006243.

Almost surely, 2^{2100222112221} is an apocalyptic number.

It is an amenable number.

2100222112221 is a deficient number, since it is larger than the sum of its proper divisors (933432049889).

2100222112221 is a wasteful number, since it uses less digits than its factorization.

2100222112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233358012475 (or 233358012472 counting only the distinct ones).

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

Adding to 2100222112221 its reverse (1222112220012), we get a palindrome (3322334332233).

The spelling of 2100222112221 in words is "two trillion, one hundred billion, two hundred twenty-two million, one hundred twelve thousand, two hundred twenty-one".