3120221 has 4 divisors (see below), whose sum is σ = 3360252. Its totient is φ = 2880192.

The previous prime is 3120217. The next prime is 3120233. The reversal of 3120221 is 1220213.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1220213 = 211 ⋅5783.

It can be written as a sum of positive squares in 2 ways, for example, as 912025 + 2208196 = 955^2 + 1486^2 .

It is a cyclic number.

It is not a de Polignac number, because 3120221 - 2² = 3120217 is a prime.

It is a super-3 number, since 3×3120221³ = 91133347093087661583, which contains 333 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 (3120281) 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, 119996 + ... + 120021.

It is an arithmetic number, because the mean of its divisors is an integer number (840063).

Almost surely, 2^3120221 is an apocalyptic number.

It is an amenable number.

3120221 is a deficient number, since it is larger than the sum of its proper divisors (240031).

3120221 is a wasteful number, since it uses less digits than its factorization.

3120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240030.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 3120221 is about 1766.4147304639. The cubic root of 3120221 is about 146.1263215232.

Adding to 3120221 its reverse (1220213), we get a palindrome (4340434).

The spelling of 3120221 in words is "three million, one hundred twenty thousand, two hundred twenty-one".