2100211020221 has 4 divisors (see below), whose sum is σ = 2100214745244. Its totient is φ = 2100207295200.

The previous prime is 2100211020209. The next prime is 2100211020233. The reversal of 2100211020221 is 1220201120012.

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

It is an interprime number because it is at equal distance from previous prime (2100211020209) and next prime (2100211020233).

It can be written as a sum of positive squares in 2 ways, for example, as 1685621839225 + 414589180996 = 1298315^2 + 643886^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100211020221 - 2¹⁴ = 2100211003837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100211020196 and 2100211020205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100213020221) 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, 823640 + ... + 2208801.

It is an arithmetic number, because the mean of its divisors is an integer number (525053686311).

Almost surely, 2^{2100211020221} is an apocalyptic number.

It is an amenable number.

2100211020221 is a deficient number, since it is larger than the sum of its proper divisors (3725023).

2100211020221 is an equidigital number, since it uses as much as digits as its factorization.

2100211020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3725022.

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

Adding to 2100211020221 its reverse (1220201120012), we get a palindrome (3320412140233).

The spelling of 2100211020221 in words is "two trillion, one hundred billion, two hundred eleven million, twenty thousand, two hundred twenty-one".