2120100221 has 4 divisors (see below), whose sum is σ = 2123628444. Its totient is φ = 2116572000.

The previous prime is 2120100197. The next prime is 2120100263. The reversal of 2120100221 is 1220010212.

It is a happy number.

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 1562620900 + 557479321 = 39530^2 + 23611^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2120100221 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 (2120100271) 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, 1763210 + ... + 1764411.

It is an arithmetic number, because the mean of its divisors is an integer number (530907111).

Almost surely, 2^2120100221 is an apocalyptic number.

It is an amenable number.

2120100221 is a deficient number, since it is larger than the sum of its proper divisors (3528223).

2120100221 is an equidigital number, since it uses as much as digits as its factorization.

2120100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3528222.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 2120100221 is about 46044.5460505368. The cubic root of 2120100221 is about 1284.6519006434.

Adding to 2120100221 its reverse (1220010212), we get a palindrome (3340110433).

Subtracting from 2120100221 its reverse (1220010212), we obtain a palindrome (900090009).

The spelling of 2120100221 in words is "two billion, one hundred twenty million, one hundred thousand, two hundred twenty-one".