2100122100221 has 4 divisors (see below), whose sum is σ = 2120915388444. Its totient is φ = 2079328812000.

The previous prime is 2100122100217. The next prime is 2100122100233. The reversal of 2100122100221 is 1220012210012.

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 1121237443225 + 978884656996 = 1058885^2 + 989386^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100122100221 - 2² = 2100122100217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2100122100196 and 2100122100205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100122108221) 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, 10396643960 + ... + 10396644161.

It is an arithmetic number, because the mean of its divisors is an integer number (530228847111).

Almost surely, 2^{2100122100221} is an apocalyptic number.

It is an amenable number.

2100122100221 is a deficient number, since it is larger than the sum of its proper divisors (20793288223).

2100122100221 is a wasteful number, since it uses less digits than its factorization.

2100122100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20793288222.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2100122100221 its reverse (1220012210012), we get a palindrome (3320134310233).

The spelling of 2100122100221 in words is "two trillion, one hundred billion, one hundred twenty-two million, one hundred thousand, two hundred twenty-one".