2101112111221 has 4 divisors (see below), whose sum is σ = 2211696959200. Its totient is φ = 1990527263244.

The previous prime is 2101112111159. The next prime is 2101112111249. The reversal of 2101112111221 is 1221112111012.

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 not a de Polignac number, because 2101112111221 - 2¹⁵ = 2101112078453 is a prime.

It is a super-2 number, since 2×2101112111221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101112111195 and 2101112111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101112111321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55292423961 + ... + 55292423998.

It is an arithmetic number, because the mean of its divisors is an integer number (552924239800).

Almost surely, 2^{2101112111221} is an apocalyptic number.

It is an amenable number.

2101112111221 is a deficient number, since it is larger than the sum of its proper divisors (110584847979).

2101112111221 is a wasteful number, since it uses less digits than its factorization.

2101112111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110584847978.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 2101112111221 its reverse (1221112111012), we get a palindrome (3322224222233).

The spelling of 2101112111221 in words is "two trillion, one hundred one billion, one hundred twelve million, one hundred eleven thousand, two hundred twenty-one".