2100112101221 has 4 divisors (see below), whose sum is σ = 2120905290444. Its totient is φ = 2079318912000.

The previous prime is 2100112101161. The next prime is 2100112101247. The reversal of 2100112101221 is 1221012110012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2048651178721 + 51460922500 = 1431311^2 + 226850^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100112101221 - 2¹⁰ = 2100112100197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100112101196 and 2100112101205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100112101251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10396594460 + ... + 10396594661.

It is an arithmetic number, because the mean of its divisors is an integer number (530226322611).

Almost surely, 2^{2100112101221} is an apocalyptic number.

It is an amenable number.

2100112101221 is a deficient number, since it is larger than the sum of its proper divisors (20793189223).

2100112101221 is a wasteful number, since it uses less digits than its factorization.

2100112101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20793189222.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 2100112101221 its reverse (1221012110012), we get a palindrome (3321124211233).

The spelling of 2100112101221 in words is "two trillion, one hundred billion, one hundred twelve million, one hundred one thousand, two hundred twenty-one".