2120223221 has 4 divisors (see below), whose sum is σ = 2244942252. Its totient is φ = 1995504192.

The previous prime is 2120223211. The next prime is 2120223239. The reversal of 2120223221 is 1223220212.

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 792422500 + 1327800721 = 28150^2 + 36439^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2120223221 is a prime.

It is a super-2 number, since 2×2120223221² = 8990693013735229682, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 124719013 = 2120223221 / (2 + 1 + 2 + 0 + 2 + 2 + 3 + 2 + 2 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2120223221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120223211) 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, 62359490 + ... + 62359523.

It is an arithmetic number, because the mean of its divisors is an integer number (561235563).

Almost surely, 2^2120223221 is an apocalyptic number.

It is an amenable number.

2120223221 is a deficient number, since it is larger than the sum of its proper divisors (124719031).

2120223221 is a wasteful number, since it uses less digits than its factorization.

2120223221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124719030.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 2120223221 is about 46045.8816942406. The cubic root of 2120223221 is about 1284.6767436715.

Adding to 2120223221 its reverse (1223220212), we get a palindrome (3343443433).

The spelling of 2120223221 in words is "two billion, one hundred twenty million, two hundred twenty-three thousand, two hundred twenty-one".