2102111112221 has 8 divisors (see below), whose sum is σ = 2226842482080. Its totient is φ = 1978789136688.

The previous prime is 2102111112203. The next prime is 2102111112247. The reversal of 2102111112221 is 1222111112012.

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

It is a cyclic number.

It is not a de Polignac number, because 2102111112221 - 2²⁶ = 2102044003357 is a prime.

It is a super-2 number, since 2×2102111112221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2102111112221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102111112271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 352345511 + ... + 352351476.

It is an arithmetic number, because the mean of its divisors is an integer number (278355310260).

Almost surely, 2^{2102111112221} is an apocalyptic number.

It is an amenable number.

2102111112221 is a deficient number, since it is larger than the sum of its proper divisors (124731369859).

2102111112221 is a wasteful number, since it uses less digits than its factorization.

2102111112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704697163.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 2102111112221 its reverse (1222111112012), we get a palindrome (3324222224233).

The spelling of 2102111112221 in words is "two trillion, one hundred two billion, one hundred eleven million, one hundred twelve thousand, two hundred twenty-one".