2110220221 has 4 divisors (see below), whose sum is σ = 2111456700. Its totient is φ = 2108983744.
The previous prime is 2110220219. The next prime is 2110220239. The reversal of 2110220221 is 1220220112.
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 219188025 + 1891032196 = 14805^2 + 43486^2 .
It is a cyclic number.
It is not a de Polignac number, because 2110220221 - 21 = 2110220219 is a prime.
It is a super-2 number, since 2×21102202212 = 8906058762234577682, which contains 22 as substring.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (2110220521) 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, 615676 + ... + 619093.
It is an arithmetic number, because the mean of its divisors is an integer number (527864175).
Almost surely, 22110220221 is an apocalyptic number.
It is an amenable number.
2110220221 is a deficient number, since it is larger than the sum of its proper divisors (1236479).
2110220221 is a wasteful number, since it uses less digits than its factorization.
2110220221 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1236478.
The product of its (nonzero) digits is 32, while the sum is 13.
The square root of 2110220221 is about 45937.1333563600. The cubic root of 2110220221 is about 1282.6532328465.
Adding to 2110220221 its reverse (1220220112), we get a palindrome (3330440333).
The spelling of 2110220221 in words is "two billion, one hundred ten million, two hundred twenty thousand, two hundred twenty-one".
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