2100110021221 has 4 divisors (see below), whose sum is σ = 2114204719500. Its totient is φ = 2086015322944.

The previous prime is 2100110021213. The next prime is 2100110021249. The reversal of 2100110021221 is 1221200110012.

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 1163569958721 + 936540062500 = 1078689^2 + 967750^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100110021221 - 2³ = 2100110021213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100110421221) 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, 7047348916 + ... + 7047349213.

It is an arithmetic number, because the mean of its divisors is an integer number (528551179875).

Almost surely, 2^{2100110021221} is an apocalyptic number.

It is an amenable number.

2100110021221 is a deficient number, since it is larger than the sum of its proper divisors (14094698279).

2100110021221 is a wasteful number, since it uses less digits than its factorization.

2100110021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14094698278.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2100110021221 its reverse (1221200110012), we get a palindrome (3321310131233).

The spelling of 2100110021221 in words is "two trillion, one hundred billion, one hundred ten million, twenty-one thousand, two hundred twenty-one".