2100000111221 has 4 divisors (see below), whose sum is σ = 2101412352192. Its totient is φ = 2098587870252.

The previous prime is 2100000111169. The next prime is 2100000111239. The reversal of 2100000111221 is 1221110000012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2100000111221 is a prime.

It is a super-2 number, since 2×2100000111221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100000111271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 706118255 + ... + 706121228.

It is an arithmetic number, because the mean of its divisors is an integer number (525353088048).

Almost surely, 2^{2100000111221} is an apocalyptic number.

It is an amenable number.

2100000111221 is a deficient number, since it is larger than the sum of its proper divisors (1412240971).

2100000111221 is a wasteful number, since it uses less digits than its factorization.

2100000111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1412240970.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 2100000111221 its reverse (1221110000012), we get a palindrome (3321110111233).

The spelling of 2100000111221 in words is "two trillion, one hundred billion, one hundred eleven thousand, two hundred twenty-one".