2101221211 has 4 divisors (see below), whose sum is σ = 2101320352. Its totient is φ = 2101122072.

The previous prime is 2101221193. The next prime is 2101221247. The reversal of 2101221211 is 1121221012.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2101221211 - 2¹¹ = 2101219163 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101221191 and 2101221200.

It is not an unprimeable number, because it can be changed into a prime (2101221251) 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, 3516 + ... + 64921.

It is an arithmetic number, because the mean of its divisors is an integer number (525330088).

Almost surely, 2^2101221211 is an apocalyptic number.

2101221211 is a deficient number, since it is larger than the sum of its proper divisors (99141).

2101221211 is an equidigital number, since it uses as much as digits as its factorization.

2101221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99140.

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

The square root of 2101221211 is about 45839.0795173725. The cubic root of 2101221211 is about 1280.8273482125.

Adding to 2101221211 its reverse (1121221012), we get a palindrome (3222442223).

The spelling of 2101221211 in words is "two billion, one hundred one million, two hundred twenty-one thousand, two hundred eleven".