2101210221 has 16 divisors (see below), whose sum is σ = 3059297280. Its totient is φ = 1272214320.

The previous prime is 2101210211. The next prime is 2101210259. The reversal of 2101210221 is 1220121012.

It is not a de Polignac number, because 2101210221 - 2⁹ = 2101209709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2101210197 and 2101210206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101210211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3646 + ... + 64928.

It is an arithmetic number, because the mean of its divisors is an integer number (191206080).

Almost surely, 2^2101210221 is an apocalyptic number.

It is an amenable number.

2101210221 is a deficient number, since it is larger than the sum of its proper divisors (958087059).

2101210221 is a wasteful number, since it uses less digits than its factorization.

2101210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62336.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 2101210221 is about 45838.9596413357. The cubic root of 2101210221 is about 1280.8251151751.

Adding to 2101210221 its reverse (1220121012), we get a palindrome (3321331233).

The spelling of 2101210221 in words is "two billion, one hundred one million, two hundred ten thousand, two hundred twenty-one".