2102102221221 has 16 divisors (see below), whose sum is σ = 3114603645120. Its totient is φ = 1401231321360.

The previous prime is 2102102221199. The next prime is 2102102221231. The reversal of 2102102221221 is 1221222012012.

It is a happy number.

2102102221221 is a `hidden beast` number, since 2 + 10 + 210 + 2 + 221 + 221 = 666.

It is not a de Polignac number, because 2102102221221 - 2⁵ = 2102102221189 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2102102221194 and 2102102221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102102221231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4499970 + ... + 4945091.

It is an arithmetic number, because the mean of its divisors is an integer number (194662727820).

Almost surely, 2^{2102102221221} is an apocalyptic number.

It is an amenable number.

2102102221221 is a deficient number, since it is larger than the sum of its proper divisors (1012501423899).

2102102221221 is an equidigital number, since it uses as much as digits as its factorization.

2102102221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9453313 (or 9453307 counting only the distinct ones).

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

Adding to 2102102221221 its reverse (1221222012012), we get a palindrome (3323324233233).

The spelling of 2102102221221 in words is "two trillion, one hundred two billion, one hundred two million, two hundred twenty-one thousand, two hundred twenty-one".